Upper Receiver and Carrier Wear - AR15.COM
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Any thoughts on why my bolt cam pin is getting gouged by the bcg/bolt like this? : r/ar15
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Is this normal cam pin wear? : r/ar15
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DDM4 V11 Metal chunks gouged out from inside of upper receiver. It wasn't like this when I bought it. I've put maybe 1500 rounds through it. Is this normal? : r/ar15
LMT cam pin wear on upper : r/ar15
Is this wear in Upper Receiver normal? - AR15.COM
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Abnormal wear inside upper from BCG cam, what's happening and how do I stop it? : r/ar15
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Review: Custom CMMG Guard 45 | Thisguy's Guns
