Brownells 75th Anniversary - A Shooting Heritage

An Easy Conversion to .22 LR for Your Upper Receiver

In this Barrel and Bolt Group Kit, CMMG provides everything you need to convert your AR-15 into a dedicated .22 LR rimfire training platform.

The barrel measures 4.5 inches long and is machined from 4140 chrome-moly steel, complete with a salt-bath nitride finish and a medium-taper profile. The barrel is optimized with a 1:16-inch twist that's compatible with most .22 LR bullets on the market, but the system runs best with 36-grain round-nose bullets.

Each .22 LR Barrel and Bolt Group Kit from CMMG also features a .22 LR sporting chamber, as well as a threaded muzzle measuring 1/2-28 TPI thread pitch. CMMG recommends using a round-style hammer in place of a notched hammer to avoid function issues. The only other piece of the kit needed for a functioning system is a dedicated .22 LR magazine.


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Cartridge: 22 Long Rifle

Length: 4.5"

Contour: Medium

Finish: Black

Muzzle Threads: 1/2-28

Twist: 1-16