Midway Satern 6.5 Grendel barrels

[elkbow]

Mine Satern barrels are 9/16-24 threads at the muzzle.

thanks, what I need to know is the exact diameter of the barrel right before the threads, so I an have a muzzle brake made that tapers to that point...of course probably isn't going to matter much as the crush washer won't fit perfectly, but I have ways I can probably do it without the crush washer