Ended up going with a Samson keymod 9". My other two ARs have regular Samson rails and I really like them so figured might as well stick with the theme. Also FWIW, I checked the MK12 gas block on one of my other rifles and it fits under the Samson rail no problem. I had heard that the MK12 was larger than other lo-pros but it isn't a problem at all in the Samson rail.
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Got mine Monday with a loose and cocked gas block.So I took it off to see two dimples in the barrel.
I asked a similar question as the OP in the pistol section with no replies
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Yep, the barrel is dimpled. Are you saying the GB wasn't snugged down in the dimples when your barrel arrived? Mine was.