AR bolt locking lug marring?

Discussion in 'AR-15 Discussion' started by kmglocks, Mar 3, 2013.

  1. kmglocks

    kmglocks New Member

    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.

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  2. Quentin

    Quentin New Member

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