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(a) To check erosion in a chrome barrel only, use barrel erosion gage (5) PN 8448496. Install bolt carrier assembly with bolt assembly and firing pin removed. Insert gage into rear of bolt carrier assembly. The reject line must be read at the rear edge of the bolt carrier assembly.

(b) If the reject mark passes below the rear surface of the bolt carrier assembly, the barrel is unserviceable and must be replaced.

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