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I have pretty much standardized on this gas block. It is simple to install the gas tube with no pounding on roll pins. Plus the adjustable feature is great to have on any serious build. The quality of Kaw Valley products is second to none!! And of course Optics Planet always has a great in stock assortment that ships quickly!
I now have 3 of these. The first 2 I purchased to build "accuracy uppers" with. One is a 6.8 with a White Oak 18" barrel and shoot's 1/3" groups with several loads. The other is a .22 Nosler upper with an Odin Works 18" bbl that also groups under 1/3" with several different loads. The quality of these uppers and the attention to detail is just great. I firmly believe the extra thickness and heat and cryogenic treating that Vltor does to them creates a perfect foundation for an ultra high quality build.
The third one of these uppers I purchased just to upgrade the receiver so my 6.8 carbine because I had put a Wilson Combat barrel on it, and I just felt the regular old mil spec upper it was wearing just didn't do it justice. :-) They are that nice.