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Accuwedge
I just purchased a new LMT upper and lower and they had a bit of play, which doesn't really affect anything, but it drives me nuts. The original accuwedge I installed was way to tight, but after trimming it down quite a bit, it now fits perfect and has taken away all the slop. I also had one in my previous colt government carbine and never had any issues with it. Some weapons just fit together snugger than others.:)
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i would much rather have a little wiggle and a SERVICEABLE rifle
than some obscenely tight upper to lower fit which requires a hammer and punch to drive out the takedown pin (see also: RRA)
i have yet to meet anyone serious about their firearms recommend this junk