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on the back side of the bolt (not the bcg), on the rounded/sloped part just behind the two c-rings where there's often a good amount of caked carbon on well used bolts, there was a solid deposit of fouling and copper.
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That's not normal for a 'new' BCG. I agree with Palmetto-Pride on the bolt not fully locking in place. Can you rotate the bolt in the carrier by hand? How much resistance is felt?
Clean, oil and retry with brass case ammo.