1F7BZ Mr Singleshot's Book of Rifle Plans Part5

8/10/2019 1F7BZ Mr Singleshot's Book of Rifle Plans Part5

1/12


2/12

5-5

lASl( ' Rt:Cl ' .1\ ' -R 'ARl 'S

drau i r rgshous he ba r re l

shank and lhe

par ts

nh ich

nrak r

u p t h e

r td hc rne thodhr r cce i r c rs

pu l

togc the r

hcn

s i l l e rb raz ings

used .

t *o rece i rc r idcs rc ongu r : nd groored < l he cce i re r ing and jo ined

hraz i i rg ,

l

he ou r

s rna l l

o l cs

f< lu r

n each

ide ) ho lvnn lhe

groore

F,U"4

o f

t h e r c c c i l e r r i n g

a r c

p r o l i d e d

t o h o l d

s h o r l

p i e c e s

f n i r e

s i l r e r - s o l d e r

r i o r

l o t h e

s i l r c r h r a z i n g op e r a l i o n . A l s o

s e e t i g .

5 - 6

f r l r a l l e rna lc rne lhod in l i cu

o l '

s i l ver -

so ldc r i

ng .

l " ig .

5-4

sr,.ct ' t()NAl

\

u..\\ 0t'

oPl . .NACt ' tON

l h i s

s h u n s l h e

c x t r a c l u r

c r lended

reanrard

and lhe lock -

i n g c r t r

i n t h e

u n l o c k e d

o s i l i o n . ' l ' h e

l u n g r r

n ' h i c h a c t i l a l c s t h e

e \ l r a c l o r i s

s l r < t u n r i t h

d o t l c d

l ines

us t

abovc the

breech

b lock

p ivo t

p in

(see

igs .

5 - l a r t d

5 - 7 ) .

- l

h c

p l u n g e r

a n d s p r i n g

s l i g h t l l r e a r -

n a r d

o f t h e b r e c c h

b l o c k

p i l o l

p i n

s c r r e s

u o f u n c -

l i o n s , l < l

a p p l r u p u a r d

l e n s i r l n < t

h c e r { r a c l o r

I o

h e l p k e e p l

e

n g a g e

n i t h

l h c e l l p t )

c a s ed u r i r r g

c r -

l r a c l i o r ra n d

a l s o

t < l

a p p l l d < l n n w a r d

l e n s i o n

< l

h e

h r e e c hb l o c k l o h e l p l p o p o p e n u p r l n u n l < l c k i n g h e

a c l i u n . A l s o r r o l e h e

c u r r e d

( c u r l e d

l o

l h e r a d i u s

o f

l h c b r c e c h b l o c k

p i n )

s u r f a c e so f

t h c r e a r

o l ' l h r

b r e e c h b l o c k

a n d l h e s u p p o r t

s h o u l d e r

i n l h e

r e c c i r c r .

A l s o

s c e

' i c s .

5 - 6 an d

5 - 7 ) .

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3/12

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i dc

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t.68

t . t {

F s .

5 -7

L l ' . 1 ' "1

t l t l ' . 1 ' . (H

l i l .O ( K S l l )1 . .

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r u s o l i l .

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c d

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s i d c sa r e r c q u i r c d ,

b o l h i d e r r t i c a l r r

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a b o r r l h e

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4/12

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rTF

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L"eo'-'l

TIRING

PIN ASSI . .MBLY

ir ing

pin

asscmbl l ,

hol l ing ront

and side iews

thc

f i r ing

pin

block, f ront

and

side

views

of the

ck accplale

and side view

of the f i r ing

p in

c t rac to r

p r ing . hc

g roured

op o f the i r i ng

p i n

scrrcsas

the loading

plat form.

A

Weaver

scope

scre$

s used


5/12

ol

I

I

o

T

t ' ig. 5-12

Tl l lGGl-R

- l -op

and

s ide

vicws

of

thc t r igger '

See cx t

f r l r delai ls.

"TE ffi tr

I " i s .5 -13

MAINSPRIN( ;

S ' I

RUT

Side

and end

vieus of the

rnainspr ing trut

and s t ru(

s leeve.

OE

I,l

L-J

{

l.-

l ' ig . 5- l ; l I .OCKING L[- \ ' l ]R ANI)

S ideand end

iews


6/12

o

m

z

{

m

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C

z

m

I

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I

i

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I

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t i g .

5 -16

STOCK AND I 'OREARM

Exact

s ize

out l ine

dra* ' ing

of

the

st0ck

and

forearm

of the

l- .D.H.

CHICOPEE

C. I . r i f l e shown

n

t h i schap te r .


7/12

ndSequence

f Operations

or

Making

he

F.D.H.

CHICOPEE

C.F. Action

&il,

As describedn

the text, this

photo

shows

he

dri l lpress et-

to

grind

the

radius surfaceon

the

rear

of the

breechblock

As

you

may already

have

noticed

f

you

have

examined he

we have not

provided you

with

every

specif ication

most

of the

parts.

We

have done this

f ,

for

example,

nF ig .

5-10

we

had

suppl ied l lo f

eeded o

make

the hammerdrawing a true

would

have

coveredan

entire

page

and

i t

and

you

sure ly

would have

thrown up

your

and

given

up on t he ent i re

pro jec t .

Making such a

would

have been

very

diff icult, but far lessdiff icult

i t would be for you to make the hanrmeraccording o

dimensions.nstead,

what we

havedone s

to

g ive

only

most

crit ical dimensions

and the

exact

sized

drawing of

parts

so that

you

can shapeeach

part

to

your

own liking.

the cutt ing out an d

making

of

many

of the

par ts ,

suchas

we

suggest

ou put

masking ape

on

the

piece

f

rom

which

he hammer s o be made,

and usingcarbon

race he out l ineof the

hammer

on i t , spot he hammer

hole and dri l l

it

and then

rough

saw and f i le the hammer

eave l i t t leextrametal

on

i t for the inal f i t t ing.

f

do not l ike the shape f the spuron

our

hammer,

hen

go

and shape

t

to

your

own

fancy. Making

the

hammer

parts n this way is far easierhan making t accor-

to a s eto f f igures.And,

i f in

the makingof a

par t , you

you

have removeda bit more metal than

our

draw-

or dimensions how, or

you

have

a

hole

dr i l led a few

probably

won' t

mat ter as

you

can

com-

or i t in th e making and f i t t ing of another

par t

to i t .

example, he hammer safety ock lever, once

you

under-

what

i ts function s

and

how i t has

o

work

i t doesnot

o be

made

exactlyas shown

n

the drawingsor engaged

the locking ever

and

hammer n

the exact

place

as

we

The

ent i redesign f the CHICOPEE act ion s such

hat

vital

specif ications

o

follow.

RECEIVER RING (seeFig . 5-5)

Make this

part

from cold rol led

steel.

You

can

use a

stan-

thread

t i f

you

have

he

means

of start ing he tap

Fig.

5-18

This

shows

he

dril lpress

set-up

o

grind

the

suppor

shoulders.

ee

exl

for further

details.

in

correctal ignmentwith

the hole. The

preferred

method

s

to

cut

the threads

n

a

lathe

setup

and

in

this case

we would

sug-

gest

going

o

l6

or

l8

threads

er

nch.

You can i t

the barre

to th is

par t

a t

the same ime. I t is important

that the

un-

threaded

part

of the barrel shank

be

a

close

it

in the receive

ring. A

threaded

portion

3/4" long is

ample. Tighten

the bar-

rel in

the

receiver ing

and turn

off the breechend flush

with

the

receiver

ing. After f i t t ing

the barrel set t asideunti l i t is

t ime for the f ina l f i t t ing

and chambering.f

you

are

going

o

silverbraze he receiver ides o the receiver ing(Fig. 5- 5)

use

a l /8" Woodruff

keyway cutter

to cut the

grooves

n the

receiver ing,

and also use t

to cut the

grooves

n the receive

sides. The four

small

holes

in each

of the

grooves

n the

receiver

ing

serve o

hold

short

pieces

of si lver-solder

wire

during the si lver

brazing operaton. They need

be only about

7

32" deep o

hold

3,/1 "

pieces

f

wire

and

of

a diameter

a

bi t larger han the

wi re

you

have.

f

you plan

to s tee l

weld

these

parts

together

prepare

the

receiver

ing and

sides as

shown nFig. 5-6.

Steel

welding

with

oxy-acty lene

orch or

wi th

an e lec t ric rc

welder

s

the strongermethod or

jo in ing

these

arts.

RI.CEMR

SIDES

(see

Fig.

5-5)

Use3/16" th ickness

o ld

rol led

lat

stock.

This

steel sual

ly has

a

hard

scale

urface hat is rather

unsight ly nd

of ten

pitted

and we

suggest

hat

it

be removed. This

can be done

quite

wel l w i th

a bel t sander

and emerycloth

be l t or

wi th

a

disc sander.The

best method, however,

s

wi th

a

sur face

gr inder .

f the

parts

are o be s i lver

brazed ogether

machine

the ongue nd

grooves

o match

hose n

the receivering

and

shape

hem o the out l ines

sshown.The

i t

of the ong ue

and

groove

cuts n

the

receiver

ing

and receiver

ides hould

be an

easy

sliding f i t requiring itt le

hand

pressure

o f i t

the

pieces

togther, with

just

enough ooseness

o

permit

si lver-solder

o

flow

throughout

the entirearea.

After the tongue

and

grooves

have

been

cut

in to

the sides,

hapeboth

s idesa l ike .

I f the

parts

are o

be steel

welded

ogether,merely

bevel

off the cor-

7E
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8/12

l1 ' the

o in t

to be

rvelded

s shown n the front end

view

F ig .5 -6 .Do no t d r i l l

any

ho les

n e i t h er i d e

a t th i s ime .

job

is

to

nrake

he breech

lock s ides.

BLOCK

SIDES

(see

Fig.

5-7)

/4"

thick cold rol led

steel

wi th

scale emoved.Two

idesare

required.We

suggest

ou

make

a carbon

f ' he breech

block s idedrawingon

a

piece

of card-

ut that

out

for

a

pattern

and

henuse

t

to cut

out one

rom

the

piece

of s tee l .

Now

careful ly

pot and dr i l l the

in

ho le

and the hinge

pin

ho le , l /64"

for the ham-

pirr

and 1/64" for

the

hinge

pin .

Clamp his

dr i l ledand

ide o another

piece

of s tee l , r i l l i t

th rough he

the one s idealready

dr i l ledand

pin

the

two together

snug

i t t ing

pins.

You can

usea

piece

cut

of f the dr i l ls

p ins .

These

wo ho les

are

now

your

master

holes or al l the remaining

operat ions

n the breech

as these

ides

must

be ident ica l .

Saw out the se-

piece

o

match

he f i rst . Mark

eachside n someway

to

and lef t

s ides.

you

are confronted

with

two operations that

ar e

and

must

be done r ight. The

f i rst

one

is

to

f i le

or

of the breechblock extension nd the face

reech) f the

breech lock eve l

and square o each

The second

r i t icaloperat ion s

o

gr ind

or

machine

he

surface

n

the rear

of the two

s ides.

h is s

qui te

easi ly

a s i rnp le r i l l

p ress

etup

Fig .

5-17) ,espec ia l ly

o

f

dri l l

press

s f i t ted with

an Atlas

compound feed ac-

a smo oth

and

level

board

(a

lx4 o ne foot long

do) and dr i ll a

hole

centered

nd 3"

from

oneendof i t in -

n,hich

ou

dr ive the

guic ie in

used n the hinge

pin

ho le .

c lamp

his board o the dr i l l

press

ableor

in

the

eed

accessory nd

place

he breech lock s ides n

p in

so hat he rear

endof the s ides

ro jec t

over he endof

l " rv ideby 4" diameter ine

gr i t gr inding

mounted

on a sh ort arbor and

chucked

n

the dr i l l

d jus t

th ingsso hat

the

rear

of the breech lock

s ides

ust

contact he surface

f the

gr inding

wheel .

With

the

urning at i ts

correctspeed nd with

one

hand

on the

block s ides

o slv ing hem in

short arcs against he

slolr ' ly 'eed

he table owards

he

wheel.

Grind unt i l

havca

smoothsurf 'ace

r unt i l

1 ,ou

ave

obtained he ap-

rad ius

of 3 .82" as shown n

Fig. 5-7. A,

s imi lar

an bc uscd o

gr ind

the

concave urfaces

n the

breech

supportshor . r lders ,

his

wi l l

be descr ibed

ater .

P I \ B I .OCK

ASSI ,MBLY

see

i g s .

5 -1 ,5 - 2& 5 -8 )

/4" co ld ro l ledstee l o rnake he block and tool s tee l

N' laking nd

part ia l ly

i t t ing

he

f i r ing

pin

b lock

u i th

thc

l , /8"

thick

breech

ace

s the next

suggested

Use

a 6r ,18

fo'eaver

copemount

screw o

at tach

breech ace o the f r ing

pin

b lock and

usea No. 6 f i l l is ter

cre* ' ,

2, '10 r 48

hread, o hold

theb lock n

place

nd

cech block

halves

ogether.The

hole for

th is screw

e dr i l led orv

so that

i t rv i l l

be

hidden

by the rece iver

not

do any dr i l l ing or

the i r ing

p in

ho le

at th is ime

the top

of

this assembly.

Make sure

he breech

sidcs re

perfcct ly

l igned

efore

and dur ing hedr i l l ing

tappingof the f i r ing

pin

block retainer

crew

hole .

.-MBI,ING RI-CF]I

V ER

SID ]S

si lver-solder ing

r welding

he rece iver

ides o

the

ing t

is neccssary

o

spot

and

dr i l l oneof the eceiver

sides

or

theh inge

pin.

You may have

a di f ferentway

of

spot -

t ing th is

ho le

but here s

the

way we

do

it .

Assemble

he

rece ivering

and he e f t rece iver

ideand hold

them ogethe

rvith

a

C-clamp, and

making

sure hat

the threaded

end of the

receiver ing is

toward the front

and that the front

ends

of

both

parts

are even.Now

take the left breech

block sidewith

the f ir ing

pin

block and breech ace n

place

and

place

he m

on the

receiver

ide.Now

take the

7/64"

thtck

piece

of

metal

that

you

wil l

later use or the

baseof the extractor

and

place

t

between he receiver r ing

and the breech block extension.

Now

push

the breechblock

side up and forward

so that i t is

f irrnly in

place

and then

clamp

it

there. Now,

using the hole

already n the breech

block side as

the

guide,

dri l l

the hole

through

he

receiver

ide or

the

h inge

pin .

Now

prepare

or

the si lver

brazing f

you

choose

o use his

method

Fig .

5-5) .

Remove

he

c lampsand the breech

lock.

Remove

any dirt and

oil that may

be on the areas

o be

brazed. Apply a

thin coat of si lver

solder lux to

the tongue

and

groove

cuts on the receiver

sides. nsert a

short

piece

of

wire

silver-soldern each

of the 8 holes

provided

and

posit ion

the

receiver

sides n

place

on the receiver ing.

Even

up the

ends

of the

receiver

sideswith

the front

of the

receiver

ing

and c larnp he threepar ts ogether . he c iarnpshouidnot be

very

tight as

we want

the si lver-solder

o f low throughout

the

joint.

If the clamping

causes he receiver

ides o come

closer

together

at the bottom than

at the

oint,

then

you

must

place

a

proper

length

support

between hem during the

brazing

pro-

cess.When

you

have it al l

al igned and clamped,

place

the

receiver

bottom

down on open

aws

of a

vise and wi th

a

low

flame from

an oxy-acetylene

orch heat

he

brazing

areaeven-

ly

to a dull red

or unti l

you

see he si lver-solder as lowed

to

the

endsand sides f

the seams. et cool

s lowly.

An

alternate method

of

joining

the

receiver

sides o

the

receiver

ing is

by steel

welding,

either by the oxy-acetylene

torch method or the electric arc procedure,preferablywith

the M.l .G. method.

Ei ther method wi l l

be sat isfactory

nd

the strength

of the

oints

and the

quality

of

the

finished

oints

wil l

depend on

your

skil l or on the skil l

of the

welder

you

choose

o do the

job.

Much

dependsalso on how well

you

have

prepared

he three

pieces

or welding

and

how well

the

three

pieces

are held

together during

the

welding

operation.

As shown in

Fig. 5-6,

you

must

prepare

both sides

and the

ring

to

make

room

to

lay in

a bead

of steel

weld

and

it

is

best

done

by bevelingoff

the top outside corner

of each

receiver

side and both

cornersat the bottom

of the receiver ing.

The

parts

can be held and

clamped ogether as

described

above

or

si lverbrazing.After

the

welding

s

partly

done

yo u

can remove he spacer nd clamp from the area hat sti l l needs

more welding

but leave n

the spacerand the

clamp on the

rear

part

of the

receiver

unti l

the

welding

s f inished

and the

whole

cooled. Afterwards

you

must

dress

down the

excess

weld.

Now assemble he breech

block sides

with

the hammer

guidepin

and

the

fir ing

pin

block assemblyn

place,

and

with

the extractor

base

n

place,

nsert

and clamp the

breechblock

in

place

n

the receiver.

Snug

t

up f irmly, forward

against

he

receiver ing

and up against t. Now

dri l l the hole

for

th e

hinge

pin

through

the

hole

already n

the

eft receiver

idean d

through the holes n

both breech

block sidesand on

through

the right receiver ide. f you wish you can f inish this hole at

this t ime, enlarging t

to 3/ 16" diameter

and

provide

a

pin

fo r

it. Rather

than dri l l ing

this

hole

to its f inal

size,

we

suggest

you

usea

pin

reamer

and ream

he hole nstead.A

3/16"

pi n
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9/12

s a

good

nvestment or th is

project

as

you

wi l l have

use

or i t later.This wi l l

assure

er fec t

al ignment f

1 'our oles.As for mysel f ,

pre fer

o usea tapered

in

for

p in .

Th is a lsoassures

er fec t ly

l igned

oles, ut in

he

holes

anyt ime

afterwards.

GUARD

(see

Fig . 5-7)

and at taching he r igger

uard

shouldbe

your

next

on the

CHICOPEE C.F . ac t ion .

Make

t

f rom

3/8" o r

old

ro l led

stockor sawor

machine t

f rom that

h ickncss

la t

stock. n ei ther ase, hapet s imi lar

o

the

v i th

or

r . r ' i thout

hc dccorat ive ips, and with

or

he spur.The front l ip

provides

good

ending

poin t

he

tr igger

spr inghole,

and

i f

you prefer

not to have

he

he rear ip

prov ides

purchase o in t

for

your

f inger

n

However

you

make t , make

he base

of

i t

i t

at tacheso the breech lock .250" th ick or the

same

s

he

i r ing

pin

block as hese wo

parts

are heonly

hat separatehe two br eech

lock s ides.

Dri l l

and tap

hole or the tr iggerspr ing o accept 6x32

or 6x40socket

set screw,

preferab ly

he

f iner

threaded ne. Now

dr i l l

or four smal lholesabout7/32" deep n the ef t s ideof

o

hold

p ieces

f

wi re

si lver-solder nd

s i lverbraze

guard

o the

eft

breech lock s ide.This ever

can

bc steel

welded in

place

or

attached

with

a screw.

beforedoing his, f wi th

the breech lock n

p lace

he bottom of the receiver

nd the bottom of

lock are

not

f lush, make

hem

flush

by f i l ing

or

SHOUl. t )ERS

(see

Fig.

5-6)

cold

ro l led

steel . he

surfaces f these houlders

be

precisely

nd smoothly

ground

o the same adiu s

as

end of the breechblock

s ides.

We

suggesthat

you

pieces

f steel " wide

and 1/8"

or so

onger

han

of the rear

of the

receiver

o

hat a f ter

you

have he

round

nto

oneedge

f each,

ust

before

he

operat ion,

you

can

cut

most

of the

surplus

of f . To

gr ind

the concave urface,we

useda 4"

gr in-

rvheel

n an arbor

in

a

dr i l l

press

nd a

holding

ix ture

of

wood which

pivoted

on a

pin

on

the dr i l l

press

able

5-18) .A

simi larsetup

was

used

o

grind

he breech

lock

On th is

wood

f ix turewe mounted

smal l

dr i l l

press

ise

i ts

aws

were

square

nd

horzontal

wi th

the ab leand

The

gr ind ing

operat ion or these

houlders as o di f -

used o

gr ind

the

breechblock in

that

when

he breechblock the entire holding f ixture was fed

gr inding

wheel,

where

as n the shoulders

r ind ing,

ture must remain

stationary except

hat i t is

pivoted

ieces

nly fed into

the

wheel .

Th is we

did

gr ind ing

one shoulder

t a t ime holding t in

the

vise

and

st r ipsof

paper

betweenhe shoulder

iece

nd bot-

of the

vise

or

the

feeding

movement ncreases.

e f i rst

i led in the

concavebefore start ing

he

grinding.

Th e

had

to

proceed

unti l a

radius was

obtained

precisely

s hat

of

the

breech lock. This

could be measured

rve

preferred

o

judge

that by

visual

nspection;holding

lock s ideand

supportshoulder

ogether n f ront

and stopping he

gr inding

whenno l ightcanbe seen

he

pieces.

radial surfaces

n the rear

of the breechblock

sides

and

support shoulders

can also be machined n

by

attaching

to the

face

plate

of a lathe. Machine

the two

breech

block s ides

together

in

one ope rat ion and the

support

shou lde rsn

ano ther pe ra t ion .

Now comes he f i t t ing

of the shoulders

o

the receiver

First, using f ine

emery

paper, polish

the

ground

surfaces n

the breech block sides and support

shoulders. Install the

breechblock

in

the

receiver

and

prevent

t

from swinging

by

also

inserting

he extractor base n

place

between he breech

block extensions nd

receiver

ing. Insert

he two support

shouldersn

place

wi th

another

piece

f l /4" th ick metal

be-

tween hem and clamp hem n

place.

Loosen

he clampa bi t

and

make

certain the shouldersare

snug against he breech

block and

hen ighten he clamp

very

ight. Now

dri l l the wo

holes or

the anchor or

guide pins

as ndicated

by the two dot-

ted circ lesmarkedB i nFig. 5-6. We

suggest s ing3/16" dr i l l

rod for these

pins,

f irst

drill ing the holesundersized

nd then

reaming

hem to size.Remove he

clamp and

you

are ready o

remove

the surplus metal f rom each

shoulder. As

each

shoulder s removed,mark it as

you

did the breechblock

sides

so that

they can be

replaced

on the correct

side.

With

the

surplusmetal removed,

dri l l 4

or

5 holes n

the

inside

surface

of eachshoulder or the

silver-solder

ire.

File and

clean he

contactingsurfaces,put in the silver-solder ieces, lux and

reassemble

he shoulders

and

pins

in their

proper

places.

Remove

he breechblock. L ight ly c lamp

the shoulders n

place

and

apply he orch. Hold the receiver i th

p l ie rs

whi le

heat ing t

so that

you

can

turn

i t

over to

watch

the si lver-

solder f low to

the edges. f necessary,

dd a bit of si lver-

solder

here

and thereby touching

he

wire

to t he hot metal .

When

he brazed reas a ve

cooled, in ish he

ob

of dress-

ing the support

shoulderdown. Also

cut out the center

sec-

t ions

of the

p ins

' lush

with

the

nside

of the

shoulder nd he

endsof the

p ins

with the

outsideof the

receiver.

TANG

& STOCK BOLT

(s ee

igs .5 - 1 ,5 -2& 5 -15 )

Top view

of the

receiver

Fig.

5-6)shows he recess

t the

rear

of the receiver.This recess

ould be mil led into

the rear

end of each receiver

side before they are

attached to the

receiver

ing,

and the support shoulders

cut down to match

after the shoulders

are

fitted with

the

guide pins

but before

they

were

silver

brazed

n

place.

Anyway,

however,

you

do it,

the recess

houldbe here.The

tangand s tock

bol t

we

used s

a l /4 " bo l t s i l ve r

razed o a 3 -4 " l eng th

f 5 / 1 6 "

o r3 /8 "

round rod

that

is in

turn si lver

brazed nto

the center of a

1/8"

thick

p la te

about 3/4" wide

and l " long.

Four

6x48

Weaver

scope mounting

screwscan

be used to

attach the

assemblyo the receiver,

r better

et ,

our

6x48socket ead

cap screws.

LOCKING LEVER

& LOCK

CROSSBOLT

(see

Figs.

5-1

5 - 2 & 5 - 1 5 )

Use 3/8"

dr i l l

rod

for the lock

bol t and l /4"

th ick co ld

rolled

steel or

the

locking

lever,

although tool

steelcan be

used or th is as t

par t .

Dr i l l an d ream

a3/8" hole

hrough

he

breechblock

s ides s

shown

n

F ig . 5-7. Notch

the

piece

of

dr i l l rod

about

one hird to one hal f way

through.Make

the

locking

everas

shown

n

F ig .

5-11but about 1, /8"

onger

o

takecare

of the hand i t t ing

hat

you

wi l l

have

o

do.

Dr i l l

the

hole

undersized

hrough

t

for

the

pin

i t

wi l l

p ivot

on,

and

through both receiver idesas shown nF ig . 5-6. With the

lock ing lever

posi t ioned

n

place,

ream

the ho le

to 3 /16"

diameter.

Use dr i l l rod for

th is

p in .

Now

the locking

ever

must

be hand f i t ted

so its

upper shoulder

engages

recisely

under he ocking

bol t

as seen n F igs .5-2

and5-3.

Take

your
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10/12

I

the action

closed,

hat

it must hold

the

rear

of the breech

block up.

We

hat

you

fit

the

locking lever

so that it en gages

nder

ock bolt about half i ts area and then wait

to do the f inal

for ful l

engagement nti l

you

have the rest

of the

ac-

finished.

However,

we wil l

describe he f inal f i t-

here

so

you

know

what

wil l have

o be

done. When

you

halfway

engagement, tart cold bluing the locking

con-

areas

on the

ocking ever

and

lock

bolt, force he ocking

back and forth a few times and the worn bluing wil l

you

the high

spots o dressdown.

You

should

end

up

lat and

highly

polished

ocking

surfaces nd a ful l , t ight

When

this

point

is reached,

t is time to

put

in

lock

bolt retainer screw. Do the dri l l ing

of the hole

with

breech block

in

the

receiver

and the locking lever ful ly

Dri l l r ight

on down and

part

way

into the

lock bolt.

and tap the hole in

the

receiver

ide o

pointed

6x40

socket

head

setscrew.Also,

somewhere

he line

you

have o dri l l the

blind

holes n

the back

of

locking

lever and in the front of the

tang

plate

for the

spring. Use a

medium

to heavy ension

spring,

the holes as deep as possiblewithout going through so

possible

spring can be used. The lock bolt

not have

to be hardened f it is made

of dri l l rod. The

to be

hardened,

especial ly

he

locking

if

i t is made

of cold

rolled

steel then

case

using

Kasenit.

But

it

should not

be

hardened

us t

point

it is

t ime to

modify

the breechblock

so that i t

and closed with

the extractor base

in

This is done

by

removing

a bit of metal from

the top

cornersof the breechblock extensions

s shown by the

A in Fig.

5-7. Only enough

metal

s removed

o

he breechblock to swing

open o br ing the top of

the

block that contains he f ir ing pin block to s top near

edgeof the chamber.The extractor

ase

must

be

when

his s done.After

the chamber asbeenmade,

should be the nex t operat ion,on ly then is i t

t ime to

he top of the breechblock

and

make

he final adjust-

on the

front

of the extensions

o bring the

grooved

block in l ine with

the chamber o

serveas a

loading

Removemetal from

the cornerssparingly,

use nlet-

spott ing

compound so that

you

can

see

what

have

to do to

get

both extensions

he same.

(see

igs. 5-1 ,5-2, 5-4

& 5-9)

y'ou

have fitted

the breechblock so that i ts face

contacts

breech nd

of the

receiver ing,

hen he breech

ndof the

should also be f lush with

the

receiver ing when

it is

n

and setup t ight . In any

case,

ou

should

make

he

a square

and

precise

it; that

is,

the breech ace

hblock

must

be

perfectly

evel,

he breech

end

of

r ing

and barrel also squareand f lat,

so that

when

block is

closedand

locked

he two

breech acesar e

and evencontact

with

each

other .

Al l

th is f i t t ing

and

must be done

with

the

extractor base in

place.

wil l not necessari ly

o

as

planned

and

if

after

al l

uork

-vou

avedone

so

far

you

f ind that

you

can

see ight

he breech aces, hen merely

put

in

a thicker breech

or

i f

there

s a

gap

on top and

not

on the

bottom,

you

the

face

plate

hinner to obtain even

contact.

ng s best

done

with

the barrel emoved.

Al l

that is needed

s a f inish

chambering eamer.

For most

smal

cartr idges

he chambering

can be done

by hand

power

with

a

tap wrench,

or the

chambercut

to

nearly

ful l

depth n

a lathe

setup and f inished

by hand.

Use a n ew

empty

cartr idge

case

for

the

headspace

auge,

cutting

the chamber

o a depth

so

that the head

of the

case s f lush with

the breech

end

of the

barrel. Use

plenty

of cutt ing

oil

while

chambering

and

be sure

to clean

all chips and

oil out of the

chamber

before esting

or

headspace.

f

you

happen

o cut

the chamber

oo deep,

hat

is, f the case hambersmore han .003" below lush, we ad-

vise

efitt ing

the barrel

back a

quarter

or

half

a turn

and

then

cutt ing

the chamber

so the

casehead s no more

than

.002"

below the

breech face.

If, after replacing

the

barrel,

the

breechblock won't

close ully with

a

case n the

chamber

hat

may mean

that

the chamber sn't

deep

enough.

Now is

the time

to

make

and fi t

the extractor.

Use

he base

that

you

alreadyhave

been using, as t is

of correct

hickness

since he breech

block

posit ion

has

been determined

by that

thickness.The

base

should be approximately

750" wide

and

2- l /8"

long.

Use he narrow

edgeof a 6" mi l l f i le

to f i le

the

slot in

the receiver ing

and

barrel for the extractor

hook.

This cut, or slot, shouldbe madeapproximatelyat a 45 degree

angle in the

center bottom

of the

barrel and receiver

ring

breech ace.As

shown n the

sectional iew

drawings, t has

o

be deep

enough or

the top

of the extractor

o engage he

car-

t r idge im

but

no

deeper. nd i t

should

be l /8" wide.We

did

it

this

way:

A

piece

of double-sided

adhesive

or scotch

ap e

was

placed

on the bottom

of the receiver

ing

and the

extrac-

tor base

posit ioned

on it. Then

holding

it in

place

with

one

finger,

the cut for

the extractorhook

was f i led in

through

the

base, eceiver ing

and

barrel all

at the same ime. When

the

approximate

correct

depth was

reached,which

is

ust

beyond

the cartr idge im

recessn

the chamber,

he

base

was

removed

and the notch in

the receiver ing

and barrel widened

slightly

and the corners

squared.Now

the basewas

reposit ioned

an d

the slot in the

basedeepened

trif le

but not widened

and

a

small

piece

of l /8"

thick

metal

much

larger

han neededwa s

fitted

into that

slot t ight

enough

so that i t

would

stay n

place

while

si lver

brazing t.

After

si lver brazing t in

place,

t was

cleanedup

and all

of the surplus

metal at

the bottom was

removed.

Then we

careful ly removed

metal

from

the front

unti l the breech

block could

be ful ly

and easily

closed and

locked with

the extractor

n

place.

Lastly, we

shortened

he

tip

of the

hook

to

chamber evel

and with

the extractorheld n

place

he

chambering eamer s

used

o cut in the rim recess

o

match

he chamber.

Figs. 5-l and 5-7 show the location of the extractor ac-

tivator

pin

and

the extractor

plunger

and

spring. The

latter

serves

o

hold

the rear

end of the

extractor

up and allows t

to

slip over the

cartr idge im. 7

64" diameter

pins

are adequate

A notch

to match

that

of the foremost

pin

must

be

precisely

cut into

the side

of the extractor

base.Both

the

plunger

an d

activator

pin

must

be checked

o see

hat they can

be depress

ed suff icientlyand

are

ust

short

enough

so as not t o interfere

u

t h

the c los ing

f r h e ac r ion .

F IR ING

MECHANISM

(se e

igs .

- l

5 -2 ,5 -3 ,5 -4

5-10 ,5 -1

&

5 - 1 3 )

Since he firing mechanism n this action s almost dentical

to the

one

n

the F.D.H.

CHICOPEE

R.F.

act ion

we

sugges

you

careful ly read

the

instruction

in

the

preceeding

hapter

under

he headingFiring

Mechanism,

as hese nstructions

ap-

ply

equally

to the

C.F. action and

are

more

detailed.
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11/12

The f i r ing mechanism

consists

f the hammer,

tr igger,

ssembly nd

he

pins

and

spr ings or

these

ar ts .

Let 's

start

w i th

the hammer,

seeFig.5-10.

Use

/4"

co ld

steel.

Size and shape t

as

per

the drawing,

spot

an d

but do not

cut in the notches

n the

bottom or

dr i l l ing

he

hole,

place

he hammer

between he

lock

sides

wi th

the holes

al igned

nd enlarge

he hole

the hammer

p in

to

1/8" .

Make

the

strut

next,

using

a

of

l/4"

cold

rolled

steeland

a

piece

of tempered

pring

120" in

diameter,

he largest

iameter

pr ing

wire

in

wi re spr ing assortment. r i l l the hole

sl ight ly

press

he spr ing

wire

stem n

place.

We

used

square od

to make

he sleeve

nd / 4"

O.D. heavy

en-

spr ing or

the ntainspr ing.

hape he head

of the

strut so

wi th

themainspr ing

n

place,

he

st ru t

wi l l

causehe ham-

to rebound

about l , /8"

from

the f i r ing

pin

block.

Makc

and f i t

the r iggernext .

Fig.5-12 )

and make

t f rom

rol led

stee l .Make

the sear

ip a bi t longer

and farther

than shown.

The hoies or

the

trigger

pin

as

well

as

lever

can

be dr i l led

clear hrough

both breech

ut i f th is s

done

hese

ins

wi l l

showwhen

heac-

open. I f

you

want

the

p ins

hidden

he

holes

can be

nside he receiver ides nd dr i l ledpart way through.

doing

he f i t t ing

a lsohave

he ock

bol t

and the f i r ing

block in

p lace.

Cut

the meta l

behind he

searend

of the

down

sl ight ly

so that the hammer

can swing

over t .

mark

anc l u t

the safety otch

n

the hammer.

Leave

he

at least

s

hick as n

the drawing.

t is

bet ter o shor ten

searend

of the

t r igger han

to make

he metal

n f ront

of

notch

oo th in . The

sear

ip must

be sharp

and re-

so, and in

order

o

prevent

uture damage

o i t f rom

a

ccidental

ammer

blow or fa l l ,

the safe ty

notch n

must

be so made

hat the

sear ip does

not

come

he bottom

of the notch

but that

the f ront

of

t r igger

ust

belorv he

searedge

does

he s topp ing

Figs.

2 &

5-4) .Assernble

he mainspr ing

nd

strut and make

ur-

adjustntents.

What

you

want

is a

suff ic ient ebound

of

o

that the

tr iggerwi l l

fa l l in to

the safetynotch

at the

sante ime

he nose

f thehammer

wi l l

be of f

o f the

p in ,

and ca nnot reach

he f i r ing

pin

i f

the hammer

s

orward.

The angle

of the

safety notch

should be

o

hat he r igger

annot

sl ipout

o f

i t when

he ham-

s

pushed

r knocked

orward.

step s

to cut

the

searnotch

nto

the hammer.

t

be on th e

same adius

as

the

safetynotch.

To

locate

he

sear

notch

has

o be,

cock he

hammer

so ts

spur s

he lock

bol t

and then mark

the hammer

where

he

To do away v i thmuch of the work of cut t ing n

searnotch

as most

hammer

guns

have,

we

make

a

step notch

and

provide

a set

screw

o l imi t

the

tr igger

i th

i t .

Cut the rear

engagement

ur face

f th is

notch

at an angle

of about

3 to 5

degreesrom

the center

the hammer

p in

ho le

so

hat

the r igger

endsmore

o s tay

here ather

han sl ipping

ut

of

i ts

own

accord.

See

5-10

or the

suggested

ngles

f the

searnotch

and

the

of the

r igger.

Of course,

he ront

surface

f the

r igger

be

simi lar ly

angled,

r even

s l ight lymore

so.

Str ive or

hammer

swing

and

place

he

sear notch

to

t ,

and t won' t

hur t

i f

you

undercut

he underside

f

spur

o

get

more

swing.

Dri l l

and

ap thehammer

6x32

or 6x40

socket

head

set

screw

to l imit

the sear

nd

dri l l

an access ole

n

the

trigger

o

make

the

Also

dr i l l

a shal low

hole

n

the front

bottom

of

the

tr igger n l ine with

the tr igger

spr inghole in

the tr igger

guard.

Usea

medium

ension

pr ing or

the r igger .A

t r igge

over t rave l

crew

an a lsobe nstal led

n

the r igger

o contac

the

bottonrof

the ocki ng ever.

And now

that

you

have

he

hammer

made, t

is t ime

to

instal l

he smal l

p in

in

the top

of

the ock ing

ever

sshown n F igs .

- 2 , 5 -3

nd5-14 .A

5 /64"

pin

wi l l

do

and t must

be a t ight

press

i t in

the

ock ing

ever

Last ly ,

dr i l l

a shal low

ole

5/32"

in diameter

n

the bottornof

the hammer

spur. The

purpose

f th is s imple

arrangements

to

prevent

he

opening of the act ion when

the

hammer is

cocked.

After

the act ionhas

beenassembled

ou

should

est he f i r -

ing rnechanism

o

make

certain

he

hammer

can be cocked

stay cocked and

that the hammer rebounds

proper ly

each

t ime i t is

snapped o al low

the tr igger o

engage ehind

the

SAFE notch. I f

th is does not happen

hen

correct ive teps

must

be taken.

HAMMI.R

SAIETY LOCK LEVER

OR

BLOCK

(see

Figs.

5 - 1 ,

5 - 2 ,5 -3 ,5 -4

an d 5 -1

)

Th is

part

can

be

made

of cold rol led

or too l s tee l . h is s a

srnal l

part ,

but a

very

mportant

one. t must not

be omit ted.

I ts funct ion s to prevent he r i f le l rom being i red unless he

breech l ock s fu l ly

locked.

n o ther words,

unless he ock-

ing

lever s fu l ly

engaged

nder

the lock bol t , the hammer

cannot

be cocked. ts

funct ion s

shown nF igs .

5-2and5-3.

I t requ i res

hand

l i t t ing

and we

can only

suggest hat

you

closely ook

at the drawings

howing

he

par ts

nvolved

and

then dupl icate

verything s

closelyas

you

can. I t doesnot

have

o be

exact ly he

sameas

shown o

work

-

i t might work

jus t

as wel l

f made

a b i t d i f fe rent .

Mount i t

on a 3 /32"

p in

and

usea l ight

ens ion pr ing

between

he r igger

nd he safe

ty

lock

lever.

One

way

of

doing

his s

by dr i l l ing

bl ind holes

in both

parts

pos i t ioned

irect ly above

or c lose

behind

he

tr iggerpin pivot ho leas shown nF igs .5-2 , 5-3and5-4.The

problem

wi th

th is

ar rangement s

to ascertain

he

correc

Iength

f

spr ing o useand

gett ing

t in

place

n

assembl ing

he

act ion. \ \ 'e

made

our r i f le

th is

way

but la ter

changed t

as

shown n

F ig .5 -12

b y

p lac ing

he sp r ing a r r he r

back and

dr i l l ing

and

appinga ho le

clear hrough

he r igger

usr

ro

rhe

rear

of the

tr igger

p in p ivot

hole and

usinga

plug

screw n

the

bot tom

of th is ho le

and dr i l l ing

a matching

bl ind hole

under

the

safety ever.

n th isway

the spr ing

anbe nserted

nto

the

holeand

he

plug

scrervurned n

to ad jus t

he spr ingno

more

than rreeded

o move

he ock ing

ever.This

spr ing

shouldnot

subst i tu te or

the t r igger

spr ingeven

hough i t

does supply

: o r r i c

ens ion

o the

r igger .

F IRTNGPIN

(s ee

igs .5 - 1 ,5 -2

& 5 - 8 )

Usea

piece

t

l l /64"

dr i l l rod.

Spot he f i r ing

pin

t ip ho le

in

the breech

acewi th

a centerpunch

hrough he i lash

hole

of an

emptycartr idge

ase n

the

chamber.Remove

he f i r ing

pin

block

assembly

rom

the breech

lock and

pos i t ion

t face

up in

a dr i l l

press

v ise

and

dr i l l a 5 /64" ho le

through

the

breech ace

and l /8"

or so nto

the

f i r ing

p in

b lock.

Remove

the

breech ace.

Usea

smal l

center r i l l

to

funnel

he shal low

hole

made

by

the

prev ious

r i l l ing .Then

with

a

l l /64"

dr l l l ,

carelul ly

dr i l l to l /8"

of

going

hrough.

Then

go

on through

r.r ' i th

916.1"

r i l l . Nolr 'nrakc

he

i r ing

pin

tc l i r . The

ip

and

the rearend, or base, hou ldbe made onger han neededo

be

shortened

s equired.When

ul ly

retracted

he

ip must

be

f in ished

lushwi th

the

breech ace

and

the base nd

protrude

from

.050-.055".

Conversely,

f fu l ly

depressed

he t ip w i l l
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12/12

hesame

mount.

Usea ight

etractor

pring

hat s

nough

o reliably etract

he iring

pin.

Themost

m-

equirement

s to have

he ip a close

ut bind

ree it

hole n

the

breech ace

and ro have

he

tip smoothly

We

recommend

hat he iring

pin

be hardened

nd

AND

FOREARM

(see

igs.

5-B&

5-16)

drawing s

anexact

ize ivided

utline

f

the

stock

on our rifle

and t

can be a

guide

n the making

shaping f

the stock

and orearm

you

may want

on the i-

you

build.

The forearm

s attached

by one 8x32

illister

screw n a

brassescutcheon

hreaded nto

an anchor

which

is in

turn

attached

o the

barrel

by two

6x48

mounting

screws.We

shaped

he

stock and forearm

oth

contact

he

receiver

o

leave

half-round

panels

o

he

ifle

a

continental ppearance.

e

also

make

t

more

n looks

by adding

an

ebony orearm

ip

and fit-

stock

with

a

pressed

orn

buttplate

and

pistol grip

This takes

extra

work

but

we

feel

it was

worth

it .

ou

may want

o make

your

stock

and orearm

dif-

erhaps

with

a fuller forearm

and

pistol

grip

without

panels, r if you aremaking herifle for a smallpersono

he stockshorter

and the

pistol grip

shorter

and closer

rigger.

TOUCHES

you

have

used ool

steel o make

any

parts

suchas

the

hammer,

etc.,

then

these

arts

must

also

be

hardened

nd

tempered.

f

you

have

made

hese

parts

rom

cold rolled

steel,

hen

they must

be

case

hardened.

This

is

easily

one

using

Kasenit.

he

entire

hammer

hould

be

so

treated

oncewith

the ower

area

of the

sear

notch

done

wice

as

directed

n

the Kasenit

ontainer.

Only

the

sear

end

of the

trigger

need

be

done

and

that

done

twice

for

extra

deep

hardening.

here

are

a few

unfinished

tems

so far not

men-

tioned.

Special

ttention

hould

be

given

o

the

sear.Make

sure

than when

the hammer

s

cocked,

he

trigger

engage

behind he searadequately o hat thehammerwill positively

not

disengage

rom

it

unless

he trigger

s

deliberately

ulled.

Adjust

the sear

engagement

crew

and he

ension

of the

rig-

ger

spring

to ensure

a

positive

engagement

very

ime

the

hammer

s

cocked.

he

riggerweight

f

pull

oughtnot

be ess

than

3

pounds.

You

may

alsowant

o have

a set

screw

o hold

the hinge

pin

from

turning

or

coming

out. We

urge

you

do

a

lot

of

polishing

on every

surface,

both

inside

and

out

of the

action. Be

sure

o

polish

he

parts

hat

need

case

hardening

before

doing

he case

ardening

nd

then

polish

hem ightly

afterwards.

There

may

be some

ast

minute

fitting

and

ad-

justing

o

do such

as ncreasing

r

shortening

he hammer

e-

bound

to no more

or less

han necessary,

o hone

the sear

facesand to lap the curved contact surfacesbetween he

breech

block and

the

support

shoulders.

You

may

alsowant

to bevel

some

of the edges

f

the

receiver

o improve

ts

ap-

pearance.

Be

sure

o stamp

he

caliber

on the

barrel. Also

stamp

our

name

and he

date f

you

are

so nclined.

nd, if

the ifle

s

one hat

you

will

be

proud

of,

we

won't

mind

f

you

stamp

F.D.H. CHICOPEE

C.F.

on the receiver

ing.
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1F7BZ Mr Singleshot's Book of Rifle Plans Part5

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Transcript of 1F7BZ Mr Singleshot's Book of Rifle Plans Part5