Just to help anyone else out that may run into this issue. I picked up my new, from the factory, Victory yesterday, and right away, before firing it, it became obvious that one of the magazines would not lock the slide back. Long story short, I disassembled the magazine, taking out the little button on the side of the magazine in the process, of course. Once reinstalled correctly, the magazine locked back the slide as it should. That little button was dragging within the channel of the magazine well, right from the start, and all the way up into the magazine well. It seemed to be sticking out of the magazine a little too far. My theory is that there must have been some plastic flashing from the manufacturing process under the button, residing in it's recess on the follower, and when it was disassembled it must have fell out, fixing the issue. So if anyone else has this problem, just try disassembling the mag and putting it back together, and you should be good to go, just inspect that recess for foreign matter. Have fun.