If you own an AR-15, there's a good chance you've spent serious money keeping it fed with 5.56 or .223. Between rising ammo costs, range fees, and limited practice time, a lot of shooters end up running their AR less than they'd like. That's where a .22 AR comes in — and once you try one, it's hard to imagine your collection without it. Whether you're buying a dedicated .22 LR AR-15 or adding a dedicated .22 LR upper to your existing setup, here's why this configuration deserves a spot in …