Ron Bartlett 830-741-7167.--Vais arms, Like Varmint hunter said they will match your contour. Measure your muzzle and send him the infor and they will match it. I think the brake diameter is .750 for most caliber diameters.
I called Redhawk rifles last week to see when they would get the Vais brakes back in stock. He said they would not be getting any in because a tornado wiped out the shop. I have no idea how true it is; but if someone knows more about the company maybe they can clear it up.