[old fart]

i just redone a nef r92, and the gun turned out good but the cylinder has small reddish brown area's here and there and in the notches. also reddish brown places in the cylder holes, i oiled as soon as finished so i don't know what it is. it doesn't look like rust as its in small tiny streaks here and there. is this rust or what?, i can't post pics as my camera is tore up right now. i used birchwood casey perma blue. thanks