MPA DN5 Bolt Action Muzzle Brake Thread - 5/8-24 or 3/4-24 tpi Caliber - 6.5mm or smaller Material: Black Nitrided High Tensile Strength Steel Function: Significantly Reduces Recoil while keeping the muzzle down Design: The multiple blast ports redirects propellent gases to counter recoil from the firearm. The unique port pattern also directs the gas upward, forcing the muzzle down. This allows the shooter to see trace and bullet impact/misses for more concise follow up shoots. These brakes are specifically designed to be used in PRS style competitions when extreme recoil reduction is required during the firing of the rifle to allow the shooter to stay on target for follow up shots. Using our special testing system, we have tweaked the design to achieve a 63% reduction in recoil.