An inert cartridge which cannot be fired under any circumstances. In America, an inert cartridge for gun functioning is usually black oxidized and may or may not have holes in the side wall of the case. An inert cartridge for display may be natural colored and should have a hole in the primer cup with holes in the side wall of the case optional.


1). A cover over the ejection port of a firearm to reduce the possibility of the entrance of foreign matter into the action. 2). The forward part of a pistol frame which protects the recoil spring.


A firing mechanism in which the trigger serves the dual purpose of cocking and then releasing the firing mechanism – either hammer or striker. Double action firearms can be manually cocked similar to single action mode. For differentiation, see Single Action and Double Action Only.