I know of three different owners of the CMMG S/S bolt kits that love them. No function problems in a Colt,two different Bushmasters and one Stag. Slight variations in accuracy with different brands of ammo. Best results in all guns using the mfg's. suggested round (Federal 550 bulk pack). Easy clean up and as stated above run a few rds of .223 thru it and the gas tube is purged. YMMV. tom.
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