I have one is 6.5 grendel. It seems built solid and it actually has a very good fit with the dpms lower I put it on. It fits tighter than a dpms upper and the del-ton upper that I have used. I have yet to shoot it though so the range report is still to come. I would buy one. Oh wait, I did.
I dont know much about double star, but I personally really like the 1/8 twist rate. A Perfect mix between the 1/7 and 1/9 twist which both seem to be the standard twist rates in most AR barrels.
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