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Upper
If you look at a few of my last posts .. we are doing many of the same things :)
My M1S upper will cycle some sub-sonics.. I found the trick with mine was the powder burn rate. I'm sticking with 1680 or slower ..
My M1S upper is a 1 to 1.5 MOA gun .. I consider it a base on which to build a better whisper .. After I get my suppressor and get it all dialed in I'm going to re-barrel !
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