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The rubber piece i sanded is the piston cup, and mine was fairly dry stock but the amount of damage to it was excessive. Im not worried about the buffer as im having a lightweight one machined for me plus i sorbod the stock one front and back as recoil is cool but cracked receivers blow.
My bolt is also polished (done by me not kj). I will attempt to take pictures ill have to find a place ti host them is all.
Cheers
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