Haven't shot it in a while, but took it out of the cabinet to check if there were any corrosion blooms like the last time I looked. None, but, I found two locations I had missed for cleaning: the hollow tubes on the bolt carrier (extending out to where the piston attaches), and the mount for the return spring. The one on the carrier wasn't bad, the one on the return spring mount was rusty, probably dating from my pre-CLP soap&water fun. I ran patches on cleaning rods thru both with CLP, which turned the rust to runny goo (way cool - what an invention). I wrapped things up & think it's OK, but you might check these out if you have any doubts.