Homemade 9mm Magazine

SIDE TEMPLATE

MAGAZINE TEMPLATE

See 'Volume One' for mainspring and follower construction.

Upper Receiver Recess Positions. 16 W length of 40 x 40 x 2.5mm tubing

(All measurements in millimeters)

Expedient Homemade Firearms

LOWER RECEIVER CONSTRUCTION.

The two templates are glued to a length of 1" x 1" x 12g tubing, as illustrated below.

Homemade Machine Pistol

After cutting out, the receiver should look like the illustrated below.

Homemade 9mm Pistol

ASSEMBLING THE UPPER AND LOWER RECEIVERS

INSERT RECEIVER

11mm

LOWER RECEIVER

Ensure top corner of magazine well protrudes 11 mm above top of receiver

INSERT RECEIVER

11mm

Ensure top corner of magazine well protrudes 11 mm above top of receiver

Homemade Machine Pistol
UPPER RECEIVER

The magazine well is held in place by silver soldering at points 'a' and 'b' or welding at points 'c' and 'b'.

Lower Receiver Illustrated Parts

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TRIGGER GROUP RECEIVER CONSTRUCTION.

The two templates are glued to a length of 20 x 20 x 2mm tube.

Homemade Machine Pistol

Hole diameters: a) 6mm, b) 7.8mm, c) 7.8mm, d) 3.8mm.

(Hole diameters not to scale)

After cutting out, the receiver should look like the one illustrated below.

Homemade Trigger Mechanism

TRIGGER MECHANISM

The trigger mechanism consists of the sear, sear spring, trigger and magazine catch. The trigger group receiver is now ready to be fitted with all the above parts. See 'Templates'.

Sear

The sear is cut and shaped from a section of 3/8" (9.5mm) steel plate (tool steel/gauge plate, etc*) The sear pivot pin hole is drilled to a diameter of 8mm and accepts an 8mm diameter dowel pin, (Figure 4, Page 32) or similar hardened steel pin.

Trigger

The trigger is shaped from a W (6.35mm) thick section of tool steel/gauge plate, etc. The trigger pivot pin hole is drilled to a diameter of 4mm to accept a 4mm diameter dowel pin, or similar (Figure 10). The second trigger hole is drilled to a diameter of 2mm and accepts a pin of 2mm diameter (Figure 11). A spring pin may be used for this purpose. The trigger should then be polished to a smooth finish.

Magazine catch

The magazine catch (Figure 7) is formed to the correct shape by bending a length of 7/16" spring steel strip material to the shape of the magazine catch template. The catch should be made from 18 or 20 gauge spring steel using the same simple methods described earlier in Expedient Homemade Firearms Volume II. The spring is bolted to the front section of the trigger guard (Figure 6). The hole in the front of the guard may be tapped to accept a 4mm diameter socket screw, or the catch can be secured with a simple nut and bolt arrangement.

Sear and Trigger Spring

The sear and trigger spring is formed by bending a length of 20 gauge spring wire around an 8mm diameter mandrel (steel rod). The shape and design of the spring will be self explanatory from the drawing (Figure 1). When the trigger, sear, and sear spring are fitted, it should be noted that the dowel pins must not protrude beyond the outer surface of the receiver wall.

The parts must be fitted in the correct order, i.e., the trigger first, followed by the spring and sear. Finally, ensure all parts are moving freely and make any necessary adjustments.

Note*. 'Gauge Plate' is readily available from any good model engineering store and from some tool shops and ironmongers, etc. Each length of plate is sold with its own hardening and tempering instructions and the hardening process can be easily carried out with an ordinary propane gas torch. Although not an 'ideal' steel for the purpose, its ready availability makes it an obvious choice for trigger and sear construction in the improvised firearm.

Note: The sear and trigger could be made quiet easily from a piece of mild steel, and case hardened using 'Kasenit' case hardening powder as a cheaper alternative to tool steel.

TRIGGER GROUP COMPONENTS

Homemade 9mm Bsp Machine Gun

COMPONENTS

1. TRIGGER/ SEAR SPRING

2. DOWEL PIN

3. SEAR

4. DOWEL PIN

5. RECEIVER

6. MAGAZINE CATCH SCREW

7. MAGAZINE CATCH

8. TRIGGER GUARD

9. TRIGGER

10. DOWEL PIN

11. DOWEL PIN

12. GRIP

13. GRIP INSERT

ASSEMBLING THE RECEIVER

M16 Grip Insert
B.
9mm Bsp Machine Gun

TRIGGER GROUP AND GRIP ASSEMBLY

Trigger Group Assembly

The trigger group assembly can now be fitted to the lower receiver.

Smg Trigger Group 9mm Bsp Machine Gun

The trigger group receiver is now fitted to the lower receiver and is held in place with socket screws 'a' and 'b'. Position 'a' is drilled and tapped to accept the screw. Position 'b' is drilled all the way through the receiver to accept a screw and nut.

The magazine is now constructed and fitted.

+11 -6

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