CMMG Dedicated 22LR AR15 Barrel | Dedicated Bolt Sold SeparatelyBuild a TRUE .22 LR AR-15! This barrel is a true 1:16 twist rimfire barrel with an integral .22 LR chamber. It requires a dedicated .22 LR bolt assembly (sold separately) and .22 LR AR-15 magazines (also sold separately). The barrel itself is premium grade and finished in the popular M4 Contour at 16.1" length. Add a dedicated 22 Bolt Group and mags and you are set to go, no additional adaptors or conversion kits necessary.