I have an m&p40 and quite often, the gun will jam up when cocking it back. The bullets don't go high enough to feed through. I've tried different magazines and they'll all do it. Now, I've never once had any issue out of all the times when I shoot it. It's just the first bullet getting chambered that does it. Pulling the slide back super fast and pushing it forward helps. But shouldn't it be easy to chamber a round? I have most of the apex tactical parts installed by the way. Is there another part I could get to make sure it never fails?