I have this Colt Combat Commander that has been customized by Bob Cogan of Accurate Plating and Weaponry, that I got from a trade last year. This is the partial list of work done on the gun: Caspian beavertail Lower and flare ejection port Greider trigger, 4 lbs trigger job Convert to series 70 Colt model Throat barrel and polish feed ramp Replace extractor with series 70 extractor and tune Replace springs with Wilson Combat springs Install EGW hammer strut and firing pin Tighten lock up of barrel and tighten slide to frame fit Smooth all sharp edges Hard chrome refinishing job ----------------------------------------------------- It's a beautiful gun, feels great, has fantastic trigger and "laser" accuracy. Here's the problem. I have taken it shooting 3 times (100, 54, and 50 rounds), using only factory ammo (Blazer brass 230Gr FMJ, PMC Bronze 230Gr FMJ, Hornady +P 200Gr TAP FPD, Federal +P 185Gr Hydrashok, Hornady +P 230Gr XTP, S&B 230Gr FMJ), with new or nearly new Wilson 7- and 8-round mags, and Colt 7- and 8-round mags. 9 times out of 10, the last round will not go completely into chamber. It will only go 50 - 75% in. I had to retract the slide slightly and gave it a wack to fully sit the round. The gun is cleaned spotless and well lubed for each range trip. First owner said he had 150 rounds of various ammo through it without an issue. I've shot the above ammo using these mags through my full-size stock Colt XSE, and never had a single hiccup. So, I don't think it's the mags or ammo that are the problem. Give me some ideas, before I say screw it and sell it for a loss. Thanks, guys. Update in post #43.