Yall know what would cause this? New build, shot 20 rounds of factory Hornady ammo. Over half the rounds have gouges on each side of the primer. Hard to get a pic that shows the damage well. Gouges leave sharp edges that you can feel. Also, leaving brass shavings in bolt face. Brass ejects at 3 o clock, throws it about 7 feet. Pistol length gas system, 16" barrel.