Again guys, thanks for the comments on this problem. I'm becoming more convinced that this is a problem with the speed of the bolt traveling rearwards. The ammo should not be a factor since the malfunctions occurred with 'name brand', American made ammo as well as the Guatemalan surplus, and the magazines are out due to the variation of the three mags, and the fact that the one that seems to be in question has worked perfectly in 2 other ARs. Take a look at this photo of the underside of the BCG. Does that amount of brass residue seem odd to you?
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