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He is a disingenuous POS. Since an AR15 is NOT a full-auto belt-fed firearm, he would never take that challenge, b/c he knows that he would lose. But enough of the sheep will believe him.I'd challenge him to do it! If he can't, then he STFU.
I don't know if it's the one you're thinking of but I remember him "racing" Kris on an episode of Sons of Guns with a Semi-Auto AK (Jerry's) vs Kris with FA.I recall a video of Jerry Miculek running 10 in about 1.5 sec's, racing a bump stop gun. If he can't get to 150/15=10rds/sec it's for damn sure I can't... forget the mag changes..