I used a J P Enterprises adjustable top rail gas block on my 20" 6.5 Grendel build.
I used the blackened stainless steel gas block I got from Brownell's.
http://www.brownells.com/rifle-parts/gas...=452000023
I used the blackened stainless steel gas block I got from Brownell's.
http://www.brownells.com/rifle-parts/gas...=452000023

