BBBBill, though you don't often see it there could be a burr at the rear of the carrier.To help determine the cause, try to see what is not happening. Does the carrier lift all the way into position? Is there possibly a screw in too far in the scope base holes binding the bolt? etc. You are probably on the right track with some judicious polishing but this could very well cure itself with a couple of boxes of rounds through it. George
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