For years, if you wanted an AR-15 that shot rimfire ammunition, your options started and stopped with .22 LR. It was cheap, it was fun, and it was great for training — but it never felt like a true step up from your centerfire build. That's changing. Rimfire AR-15 platforms are now being offered in .22 WMR (Winchester Magnum Rimfire) and .17 HMR (Hornady Magnum Rimfire), and the shift is a bigger deal than it might sound at first. Why This Matters for AR-15 Shooters The AR-15 platform has …

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 …