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hey i have a v1 m4 and there is a bit of slop or wiggle room between the upper and lower receivers. has anyone figured a way to eliminate this wiggle? shims etc? it seems to be coming from the front take down pin, the part of the upper that attaches here isnt a tight fit into the front of the lower. its not major, i just dont like having lose parts esp when they can affect the alignment of the operating mech....
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