Ok first thing first this issue is with my taurus PT1911, so go ahead laugh and make fun...... ok now that its out of your system here is the issue. My pt1911 was my first 1911 (I have a colt safe queen also) and it is my beater 1911, it goes to the range and gets shot alot. Story is it will not lock back on the last round in the mag any more. I have used the factory mags, kimber mags and chip mags. All with the same effect. Funny thing is I thought at first it was my reloads because i loaded kinda light and never had the problem with WWB ammo before I started reloading. But I loaded a bath of really hot rounds ( I mean these suckers kick!) But still have the same issue, wont lock back on the empty mag, and I know there is enough force pushing the slide back. What do you all think?