Gousselet

Example:The chamber was not properly inserted into the gousselet.

Definition:A space or cavity, especially one formed within a solid structure, as the space into which a bullet or shell is loaded in a firearm.

Example:The gousselet acted as a holder for the projectile during loading.

Definition:A device that holds or supports an item, keeping it in a fixed position, as a gousselet holds a cartridge in a firearm.