I'm looking at a Sig 220, used. I read alot of positive comments in the search I did here. I'm looking at it for a daily duty pistol. Any long term users have any trouble with these? I've seen a couple on-line that had what appeared to be 10 round mags. Are these after market? Last question, a couple of well used 220's I've looked at, had what I considered sloppy slide to frame fit. Others, less used, were tight. Does the 220's aluminum frame hold up to alot of shooting? Thanks. Regards 18DAI.