Don't build a .22 LR that looks like an AR, build an AR that happens to be chambered in .22 LR. Equipped with a 4.5" barrel, the shortest CMMGA(R) offers in any caliber, this BANSHEE(TM) upper group is built on the Mk4 platform, and is designed to work with any standard AR15 lower group and use CMMG's .22 AR Conversion Mags. All CMMGA(R) Upper Groups come complete with bolt carrier group and ZEROED(TM) accessories including:ZEROED AR15 Polymer Dust CoverZEROED .22LR Ambi Charging HandleZEROED .22LR Flash Hider