Double Barrel Derringer p1 Revolver Pistol, Homemade Shotgun, Socket, Pocket Pistol, Knife. Derringer Assembly Instructions | Firearms | Projectile Weapons. The Cobray Company was an American developer and manufacturer of submachine guns, automatic carbines, handguns, shotguns, and non-lethal 37 mm launchers.The Cobray Company was a manufacturer of sub-machine guns and semi-automatic carbines, handguns and shotguns as well as non-lethal 37 mm launchers.