An illicitly manufactured automatic pistol seized in mainland China. Such pistols are often hand manufactured in rural basements to be sold on to gun runners who turn huge profits selling to buyers in coastal cities.
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.