Rimfire Ammo

Rimfire ammo is one of the two major cartridge ignition technologies in widespread use. When the trigger of a gun firing rimfire ammo is pulled, the weapon’s firing pin strikes the edge, or rim, of the cartridge’s base and ignites the primer. This, in turn, ignites the propellant in the case, firing the bullet out of the gun. While large caliber rimfire cartridges were once common, most rimfire ammunition used today is of relatively low caliber; the most popular of these is the .22 Long Rifle, which is primarily used for hunting and target shooting. Firearms chambered for rimfire cartridges are diverse and range from single-shot precision target guns to AR-15 derivatives.