R3E2C MUZZLE BRAKE
"Maximum Recoil Reduction With Reduced Blast
Single, large expansion chamber with forward baffle, traps and redirects muzzle gases to greatly reduce muzzle rise and blast. Dust printing and muzzle rise are all but eliminated. Stainless steel construction for superior resistance to powder corrosion. For all calibers center hole is .030" over bullet diameter. May be gunsmith enlarged to larger diameter. Available with .575"-40 tpi; allows installation on smaller diameter, slim-tapered barrels that require a shallow thread depth to maintain maximum bore to O.D. wall thickness. Exclusive supplier to elite U.S. military forces.
SPECS: 304 stainless steel, polished finish. 2.6" (6.8cm) long. .866" (22mm) and .970" (2.5cm) diameter. Muzzle hole can be enlarged for other calibers. "
From the Brownells website
$115 for a brake, give me a brake