Benzene, brass is pretty slick in its own right. Polishing it might help minimally, but it's no substitute for having the steel surfaces deburred and polished. Sharp edges can actually cut into the brass.
I forgot a couple of touches on a carry gun job. The rails on both the frame and the slide need to be checked and and polished if any roughness is found. An overpower slide spring should be installed if the gun is only to be used with full house loads.
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