I have an upper with 16 match grade stainless barrel from a reputable manufacturer that has been reliable for almost 1000 rounds. lately it has had problems feeding the primary ammo that I feed it(hornady 75gr superformance), the round will hang-up in the barrel extension lugs just above the feed ramps. it will also fail to feed 75gr hornady from a bolt locked to the rear. I have mounted it on multiple lowers and used different magazines with the same results. it will feed 55gr fmj with no apparent issues. Any info or advice would be appreciated.
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