Brand new and tried with stock mag, pmag, 223 american eagle, 5.56 m855 winchester. Took it to a gun shop owner who says its not the mag but the barrel. Looking at the manual, it gets caught up on the barrel extension, or part 104. I don't know if its getting caught up or can't get up over it. Anyone experience this? Anyone have a solution? edit. damn orange piece of plastic down the barrel. please delete thread.