I just got my AOM180 yesterday. After doing a quick clean on it, I loaded the 15 round magazine with Armscor ammo. At first I couldn't get the bolt to catch a round to feed it into the chamber; it just slid over the top. I removed and re-inserted the magazine a couple times, and it began to pick up the ammo. Then I had another issue. About every other round would chamber in front of the extractor, and I would have to force it onto the round to fire or eject the round. The Promag magazine I picked up did better, but it wasn't perfect either. Anybody have any ideas what might be wrong?