The advanced SureFire SFMB-338-5/8-24 muzzle brake” which fits 8.60 mm (.338 caliber) rifles with 5/8-24 muzzle threads” greatly reduces both recoil impulse and muzzle rise and features neutral porting. Its patented Impulse Diffusion design minimizes side blast and rear-directed concussion effects. The SFMB-338-5/8-24 also serves as a rock-solid mounting adapter for .338 caliber SureFire SOCOM Series Fast-Attach(R) suppressors. Precision machined from US mill-certified heat-treated stainless steel bar stock-including high-precision single-point cut threads for optimum thread interface-the SFMB-338-5/8-24 muzzle brake is given a black Ionbond DLC coating. When used in conjunction with a SOCOM Series suppressor” the patent-pending design of the SFMB-338-5/8-24 provides multiple bearing surfaces to ensure superior suppressor alignment. A rear labyrinth seal minimizes potential carbon buildup in the indexing system and facilitates suppressor removal after extended firing. All SureFire SOCOM Series muzzle brakes have blind pilot holes at the 3 and 9 o’clock position to enable fine-tuning of recoil characteristics for individual shooting styles or ammunition characteristics. They also have blind pilot holes at the 6 o’clock position to enable indexing the adapter at bottom dead center” and to pin-and-weld on short-barreled rifles. SureFire muzzle brakes are individually inspected for concentricity and alignment” and each is covered by SureFire’s No-Hassle Guarantee.