Not a pa of firearm:
Correct Answer: Piston
Description: Firearm:- Any instrument or device that discharges a missile by the expansive force of gases produced by burning of an explosive substance.It consists of: i. Barrel: A hollow metal cylinder in which the propellant charge is placed. It is long in rifles and shotguns, and sho in pistols and revolvers. The lumen is known as bore. ii. Action: It consists of a bolt, a striker (firing pin) or hammer, and a trigger. iii. Extractor: is a pa of a gun's action which serves to remove brass cases of fired ammunition after it has been fired from the chamber of the gun. iv. Butt/grip: Rear poion of stock in a shoulder arm or bottom of a handgun containing a magazine. v. Magazine: The receptacle for the caridges in a repeating type of weapon from which the caridges are fed automatically into the chamber by the action of mechanism. Bolt-A bolt is the pa of a repeating, breech-loading firearm that blocks the rear opening of the barrel chamber
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