A quick and dirty improvised firearm assembled using pipe fittings available at any hardware store. Ammunition in this case has been improvised using nail gun charges with the crimp removed and a lead projectile inserted. The weapon functions by pulling back the ball end of the spring loaded striker bar and releasing to fire.
This six shot improvised 12 gauge shotgun, which is incomplete, was seized by police along with Satan’s Plants by police in Brazil. On this crude example the drum is formed from multiple steel tubes welded together with a thumb screw below which is tightened to align and lock each chamber. The firing mechanism is missing.
An example of a criminally used improvised 12 gauge pipe shotgun. The front tube houses the barrel while the rear tube contains a spring and a striker which is pulled to the rear and released to fire. A bolt attached to the front of the rear piece allows the gun to be locked and unlocked in a bayonet type fashion for loading and unloading.