Have a Standard model. It's a long way from being a match, but I'm a long way from being a marksman. It's accurate enough for me.
Got it last year, used but not much. Remembering my M14 Army days, I wanted to check the gas piston for carbon. The gas cylinder plug was so tight a gunsmith buddy of mine had to vise it down and take a breaker bar to unscrew it. I think we left these snugged down but removable to check for routine maintenance, so that's the way I left it. Don't know if it was over-tightened at Springfield or someone LocTited it, but the piston was fine.
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