I just got this new break the other day from Ross Schuler. He custom machined it to match my barrel OD and gave me the tapper I wanted which was 20deg and drilled the port to .020" over bullet diameter (.284"), and tapped it to match my barrel thread (9/16-24). I was very impressed with his handy work and machining skills. At $45 shipped this was an outstanding deal. It tops off the Grendel with style.
Here's his web site. http://home.comcast.net/~MOA_Shooter...zzleBrakes.htm
yep its a Satern 24"... it just needs some cerakote