The CMMG Bolt Group Kit and 4.5″ 22LR Barrel will fit in any milspec AR-15 upper receiver and is compatible with the CMMG 22ARC Grey magazines. Installation of the barrel is identical to a standard AR-15 barrel, but does not require the use of a gas block or gas type.
This kit is for use with a dedicated 22LR AR-15 upper, and is not a conversion kit for .223/5.56 barrels.
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