position or a magazine loaded with defective ammunition may cause a round to fire every time the bolt closes until the magazine is empty. Shooters must keep the firearm pointed in a safe direction ("downrange") while closing the bolt and chambering a cartridge. If a slamfire does occur, the shooter must do his or her best to hold the firearm securely pointed in a safe direction until it ceases firing. This requires discipline, because untrained shooters may become surprised and instinctively drop the firearm as soon as it begins firing. Aside from the dangers of any accidental discharge, an out-of-battery ignition may occur if a round slamfires before it is completely secured in the chamber. The firearm may be damaged or destroyed by a breech explosion potentially injuring the shooter and bystanders. Intentional slamfire designs Pipe guns use a free floating gun barrel with a rimmed cartridge (often a shotgun shell) inserted in the breech, sliding within a pipe functioning as a tubular receiver with a fixed firing pin in the back. No trigger or lockwork is required, because the loaded barrel is simply inserted into the pipe and slammed backward to fire. See also Firearm malfunction Recoil operation Bump stock References Firearm terminology