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kmglocks 03-04-2013 02:33 AM

AR bolt locking lug marring?
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My cousin just got an AR Stoner mpi bcg. We put it into his new PSA AR and fired 120 rounds through it just to pop it's "cherry". After taking it apart and cleaning it I noticed some marring on the bolt locking lugs. Is this normal? I have never seen it before on any other ARs before. Is this going to be a problem? Any advice is appreciated.

Quentin 03-05-2013 03:38 PM

Does the Stoner bolt lugs have the KAC proprietary rounded design? If so it's not made to work with a standard barrel extension.

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