Reign Over Recoil. SureFire SFMB muzzle brake suppressor adapters greatly reduce both recoil impulse and muzzle rise so that your weapon tracks straight back, keeping you on target for faster shot-to-shot recovery. Their proprietary Impulse Diffusion design minimizes side blast and rear-directed concussion effects. Precision machined from U.S. mill-certified heat-treated stainless steel bar stock and DLC-coated for extreme durability, they are available for a variety of weapon calibers and muzzle thread specs, and every SFMB serves as a rock-solid mounting adapter for SureFires combat-proven SOCOM Series Fast-Attach suppressors.Features :Multiple Bearing Surfaces for Superior Suppressor AlignmentHigh-precision Single-point Cut Barrel Threads for Optimum Thread InterfaceDLC CoatingLabyrinth Seals Prevent Carbon Buildup on Suppressor Lock Ring Indexing SystemWill fit 6MM and 6.5MM Caliber Barrels Threaded in 5/8X24