CMMG 22D5B6E Replacement Barrel Kit with Bolt Carrier Group, 22 LR 4.50″ Threaded, Black Nitride Chromoly Steel, Fits AR-15/Mk4

The CMMG 22D5B6E is a complete conversion kit engineered to transform your current AR-15/Mk4 upper into a dedicated .22 LR platform. This kit includes a replacement barrel and bolt carrier group, featuring a 4.50″ threaded barrel constructed from black nitride chromoly steel. Simply add a magazine to your setup and you’re ready to shoot. For optimal performance, fit a round style hammer, as notched hammers can cause function issues, and use 36 grain plated nose bullets, which have proven most reliable for consistent functioning.