. . . . "C. Check the Feed Latch movement is free and the mounting stud not worn.D. Check the magazine tube is secure and the soldering has not failed.E. Check the Carrier Latch on the trigger group is not Broken.F. Chech the action bar support is not brokenG. Check the extractorr is not Broken.H. Check O-Ring and rings for wear.A, B, and H are the most likely fixes." .