Expedient Homemade firearms
Prototype Design Drawings
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.
.
The receiver is basically a steel tube into which the other component parts are
fitted. It consists of a 9 ¼ “ (233mm) length of 15.88mm (5/8”) x 1.5mm steel tubing,
as illustrated below. Into this tube a slot is cut, either by drilling a series of
interconnecting holes first, and then trimming the slot to shape with a file, or (for
the lucky individual) cut using a milling machine, if available! The slot should be ¼”
in width and will accept the breech block handle in due course. The slot is 98mm in
length, starting 67mm from any end of the tube.
C
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(
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)
)
1. Barrel
2. Breech Block
3. Breech Plug
4. Mainspring
67
98
Small Cut out in rear of slot to allow the weapon to be cocked.
Expedient Homemade firearms
Prototype Design Drawings
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.
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The Barrel can be nothing more than a short length of steel Airgun
barrel, turned to a diameter of 12.70mm (½”). The length of the barrel is
75mm. One end of the barrel is chambered using a 5.8mm diameter drill
bit to accept the .22 rimfire cartridge.
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The breech block is just a 58mm long section of ½” diameter mild steel
bar. Into one end of the block a firing pin is fitted, made from a short
length of 2mm diameter drill shank. The pin must be carefully fitted so
as to be in the correct position to detonate the .22 rimfire cartridge.
75mm
58mm
Near to one end of the breech block a ¼” Dia’ hole is drilled
to accept the breech block cocking handle. The handle
consists of a simple steel pin about 1” in length.
FIRING PIN
BARREL
Breech Block
Expedient Homemade firearms
Prototype Design Drawings
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The mainspring powers the breech block and should be reasonably
strong. I designed this gun to use a spring about 8- 9mm in diameter
and made from 20 gauge wire.
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The breech plug is responsible for holding the spring and breech block
in place. It consists of nothing more than a 1” x ½” spring pin.
The pin is held in place by a 6mm diameter steel bolt and nut which
passes through the receiver from side to side, as illustrated below.
F
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Pull back cocking handle and turn to right to cock weapon.
Load cartridge. When ready to fire disengage handle using thumb or
finger……
Bang!
Pull Back Handle
Bolt
This design may be very simple, but I think it would be easy and quick
to build !
Breech Plug
(Spring pin retained with
nut and bolt)
Breech Block
Barrel
Expedient Homemade firearms
Prototype Design Drawings
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.
Armitage Pen Gun.
www.lawdogs.8m.com/ catalog.html
‘’Stinger’’ Pen Gun.
www.gurpsmaster.de/ undercover.htm
‘‘Mini Mag Light’’ .22 Torch Guns.
www.lawdogs.8m.com/ catalog.html
Expedient Homemade firearms
Prototype Design Drawings
American factory made ‘’Pen’’ pistol.
www.gurpsmaster.de/ undercover.htm
Unknown origin. Very nice homemade Pen Gun.
http://membres.lycos.fr/abpw/22-misc/pages/Pen_Gun1_by_Nobody.htm
Expedient Homemade firearms
Prototype Design Drawings
A .44 calibre Pen Gun. This is an old collectors piece made by the ‘Lake Erie
Chemical Co’.
www.adrax.com/ watsons/pengun.htm