Buffer, Schmuffer. You've been served up a perfect CLUE in that one works and the other doesn't.
Listen to Clint and Gunz. Get good lube in there and isolate the problem using the carrier swap test suggested.
Also... what is the barrel length on this? I'm not sure what a "mod 2" is exactly. If it's a 14.5 and you're running PMC bronze... that's a bad combo.


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