I brought my new AR to the range today and put 69 rounds through it. 30 HSM 5.56 75gr, 12 BHBB 75gr, and 27 Guatemalan M193 surplus. The reason that I only shot 27 of the Guat instead of all 30 in the box is that three of them failed to feed. The tip of the bullet ended up pointing above the chamber, and the bolt ended up closing on the side of the brass case. I don't find it easy to fault the ammo, since it's been fine in my other rifles. This AR is a 14.5" w/carbine gas system, and an H-buffer. Brand new. Bought the upper and lower, each fully assembled. The gas key is staked, and solid. What appears to have happened is that after firing a round, the bolt, on returning to battery, is catching on top of the brass, just forward of the case head. I had it happen while using a used steel magazine, and also with a brand new Pmag. Can anyone help explain this one? See below.
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