The .22 Long Rifle or simply 22 LR Ammo (metricdesignation: 5.5×15mmR) is a long-establishedvariety of .22 caliber rimfire ammunition originating from the United States. It is used in a wide range of rifles, pistols, revolvers, smoothbore shotguns, and submachine guns.
22 LR Ammo In terms of units sold it is by far the most common ammunition in the world today. Common uses include hunting and shooting sports. The .22 Long Rifle is effective at short ranges and has little recoil making it ideal for training.