I have 11 1/2" ar-15 pistol and am having cycling issues. Ran 60 rounds thru it with zero issues friday afternoon. Fast forward to late Friday night. 30rounds flawless, put another magazine in and the first few rounds were fine but then it jammed. Eject a round then fire, then jam, eject, fire jam, eject, fire, jam. The rest of the mag went this way. It was a new p-mag if that matters.