Hey guys, just wanted to see if anyone had any advice on what direction I needed to head in. As the title states the slide doesn't lock back, on empty, when I use Wilson Combat 7-rd mags in my STI Guardian, .45acp version. When I use the factory 6-rd mag everything works as it should. Something else I've noticed is that when inserting the WC mags there is a little resistance on the mag at about 3/4 of the way in. A hair bit more of a push and it seats just fine. The factory 6-rd goes in smooth. Both mags work great when firing, chambering and extracting. What I want is a 7-rd capability and for the slide to lock back on empty. Any ideas?