11-19-2012, 04:15 PM
I have an AA 14.5" upper that intermittently (25% of the time) fails to feed. The symptoms are a round stuck at 45 degrees with tip of the bullet in the receiver extension. The cartridge case has a couple of indentations just bellow the shoulder which I'm assuming are caused by the bolt. The upper is a factory AA unit. I've tried multiple magazines (AA 10 rounds, CProducts 25). 2 lowers with H2 buffers. I'm pretty sure i tried an H buffer at sometime as well. Wolf MPT and Hornady A-MAX ammo. The bolt locks back on a single round. I would say the problem lies with the upper. I looked in the chamber and nothing stands out. The hardware is a couple years old. I had problems so I shelved it. I recently tried using it again.
Any ideas as to what's wrong?
Any ideas as to what's wrong?