This CMMG Barrel and Bolt Kit has the key components of what you need to convert your existing upper to a dedicated .22LR. For best performance use a round style hammer as notched hammers can cause function issues and 36 grain plated nose bullets have proven to be the best choice for function. 9a ^2 Barrel length 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:16 Twist 22LR Sporting Chamber Threaded 1/2-28 Mfg: Cmmg
