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so I just built my first ar15.complete bear creek upper, aero lower, strike industries enhanced lower parts kit, and a ed2 trigger. I took it out for the first time today and the rifle will only fire sometimes. What I mean by that is it will shoot one or two rounds then the next round the bolt will stoke the primer and leave a dent but it's like the primer isn't igniting or something. I'm using American eagle 5.56 ammo. I do not know a ton about ar15s so don't beat me up too much on this if it's something simple lol.