r/22lr

.22 Long Rifle

The .22 Long Rifle rimfire cartridge (5.6×15mmR - metric designation) is a long established variety of ammunition, and in terms of units sold is still by far the most common in the world today. The cartridge is often referred to simply as .22 LR and various rifles, pistols, revolvers, and even some smoothbore shotguns have been manufactured in this caliber.

r/22lr is a SFW subreddit with 42 thousand subscribers, created in 2010.