New to me G30 - I purchased it as new but from an individual. Gun is dated 5/13/09. Field-stripped the gun to inspect and things look fine. Not much gold grease / anti-seize, so it's at least been field stripped and wiped down. There was a bit of oil on it, which I know doesn't come from Glock, but I didn't see any signs of use / abuse, so I feel comfortable that it's new as was advertised - not disputing that. Re-assembled, and the recoil spring assembly was protruding from the slide about half an inch - things didn't lock up. First time this has ever happened to me with a Glock. Took it back apart, re-assembled, same thing. Took a few tries to get it back together. Anyway, I put 75 rounds through it today at the range and about 8 of those rounds would not chamber / the slide wouldn't return to battery (two different magazines). The nose of the cartridge was in, and when I smacked the back of the slide it moved forward (but stiffly). Any thoughts on this? I've never experienced anything like this with any of my Glocks, so I'm not sure what to do at this point. My current course of action is to clean her up, check for anything that may be out of place, and shoot her some more. Should I be concerned? I also noticed the front of the recoil spring assembly doesn't sit flush with the front of the slide - is this normal? Thanks.