A 9mm submachine gun designed to be ultra compact and use the least number of parts possible. Nearly all components are made from square tubing including a one piece push trigger which is operated with the user’s thumb.
Here are photos sent in of a pair of homemade revolvers built from the Professor Parabellum DIY .22 Revolver plans.
The version below is chambered in .22lr. A flip down side loading gate was added to the design as an improvement.
The second gun is a ‘cap & ball’ version of the first which is chambered in .25. It was built as an exercise in demonstrating that a viable firearm can be produced without relying on any firearm components. Staying with the makeshift theme, plastic toy caps are used in place of regular percussion caps in combination with homemade gunpowder. Apparently this version shot accurately despite being smoothbore.
Full build video:
Successful test fire: