Installation is incredibly simple and is achieved by replacing the original bolt carrier assembly with the drop-in conversion unit and using a compatible rimfire magazine. No permanent modifications are required. Includes one 10 Round Evolution Magazine. For Semi-Auto AR-15's chambered in 223 Rem/5.56 NATO only, kit is NOT for use with full auto M-16's. Works with CMMG and Black Dog Machine Rimfire Conversion Magazines.
NOTE: Rimfire conversion kits are NOT compatible with Gas Piston equipped AR-15's.