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Using the same green tip ammo (Federal XM855 from Lake City) 62 grain each time. Only happening once or twice per 30 rd mag, and only started when quick firing (multiple double tap). Unless someone traded the Lake City rounds in the can for identical reloads, I don't think its the ammo causing the problem. I'm waiting for Rock River to return my email.
Never fired a brand new M16/M4 or AR, is there some kind of break in period I don't know about?
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