Fitting The Mainspring

Bsp Smg Homebuilt

After placing the bolt into the upper receiver, the mainspring can be inserted, followed by screwing on the BSP cap.

(See final page, ''Construction Notes'' for tips on acquiring mainspring).

Drill two 2mm diameter holes through the Magazine body and cap to retain the cap in position.

Magazine Template

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A 34.93 x 15.88mm plastic tube cap is used to seal off the bottom of the magazine.

As shown in Expedient Homemade Firearms -The 9mm Sub-Machine Gun, the magazine is made from a section of 34.93 x 15.88mm rectangular tubing.

As a design improvement i have added a plastic tube cap, retained with two pins, to act as the magazine base plate.

Bsp Sub Machine Gun

FITTING A SHOULDER STOCK

It is quiet possible to construct a simple folding shoulder stock for the BSP machine gun using nothing more than a modified 3/8" ratchet spanner and a length of steel tubing! The following pages illustrate how this is done.

Bsp Smg Full Auto

Folding Shoulder Stock.

PHOTO OF SHOULDER STOCK COMPONENTS

The shoulder stock is assembled from a 3/8" ratchet spanner, a length of 5/8" round tube, a section of V2" box tube, four washers, a cotter pin, and a length of 1" x 1/8" steel plate.

Bearing Shoulder

ASSEMBLING THE SHOULDER STOCK

MATERIALS REQUIRED

1. 3/8" ratchet spanner.

3. V2" x 16g box section tube.

V2" tube r

Insert tube onto ratchet and retain using high strength bearing adhesive.

3/8" Ratchet spanner. The ratchet spanner is cut down and shortened until it has an overall length of around 4 - 5'

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Slide washers onto tube.

A series of washers are placed over the V2" box section. These may consist of either four standard 'light' washers or two to three thick 'heavy' washers. Either way, the stack of washers must result in a combined length of 4 - 5mm.

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REAR VIEW OF WEAPON SHOWING SHOULDER STOCK ATTACHED TO

RECEIVER

Bsp Homemade Gun

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