Homemade Submachine Guns


The weapon shown in the following document has not been built and is therefore a prototype design only. All photo's illustrate plumbing/ hardware components shown in their unmodified as bought condition.

*For academic study purposes only.

British Standard Smg

i JA

The 9mm BSP' Sub -Machine Gun

The following design drawings illustrate the construction of a 9mm submachine gun utilizing off the shelf 'British Standard Pipe' (BSP) Fittings. BSP fittings, commonly known as 'Malleable Iron Fittings', are readily available from most good trade plumbing outlets. Because this BSP machine gun design uses some of the same components seen in 'Expedient Homemade Firearms' Volume I, I have not discussed their manufacture again here, for fear of boring the reader, and myself. The magazine and magazine well being two examples. The following design is offered on the understanding that the reader is already familiar with the firearm construction methods shown in my previous 'Expedient Homemade Firearms' books. I will leave the reader to decide whether this design is good, bad, or somewhere in between!


9. 5/8"x 14g steel sheet.

10. 6mm studding connectors x 2.

14. 35mm dia' rubber stock.

18. /" BSP Threaded Tube.

20. 15.88 x 3. 25mm Hydraulic tube.

21. Assorted nuts and bolt.

15.88 x 3.25mm tubing 1/2" BSP Socket. 1/2" BSP nipple. /" BSP lock nut 1 /" x 1" BSP reducer. Magazine Catch. Magazine. Trigger. Trigger Bar. Bolt. Sear.

Mainspring. Stock anchor point. 1" Diameter x 1/8" tube. Rubber buffer. 1 /" BSP pipe Cap.

Improvised Firearm

Expedient Homemade Firearms. BSP-SMG


(Internal Components. Hole Diameters Arrowed)




Trigger Bar.


9mm Pipe Gun

Trigger Guard.

14 gauge sheet steel.

Trigger Guard.

14 gauge sheet steel.

Magazine Catch.

20 gauge spring steel.

Magazine Well.

40 x 20mm Tube.

Magazine Stop. 40 x 20mm Tube.

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