A 12 gauge shotgun pistol design locally made by illicit gunsmiths in Thailand. This model was also commonly made in The Philippines though was eventually sidelined with the availability of cheap automatic pistol copies.
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.