SureFire Supressor Adapter/Muzzle Brake, fits 6.8 mm rifles with 5/8-24 muzzle threads. It greatly reduces both recoil impulse and muzzle rise so that the weapon tracks straight back to keep you on target for faster shot-to-shot recovery. The patented Impulse Diffusion design minimizes side blast and rear-directed concussion effects. The SFMB-68-5/8-24 also serves as a rock-solid mounting adapter for SureFire SOCOM Series 6.8 mm Fast-Attach 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-68-5/8-24 muzzle brake has a black Ionbond DLC coating to provide maximum protection under harsh environmental conditions and to facilitate cleaning even after extreme use.