Masterpiece Arms Master Piece Arms DN5 Bolt Action Muzzle Brake - 30 Cal 207B1CBB MQ. This version is designed for calibers that generate additional gas pressures and volume such as 308 Winchester 7MM PRC 7mm Saum and other calibers 308 or smaller. 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 63percent reduction in recoil. Specifications for Masterpiece Arms Master Piece Arms DN5 Bolt Action Muzzle Brake - 30 Cal 207B1CBB: Manufacturer: Masterpiece Arms Fabric/Material: Steel Features of Masterpiece Arms Master Piece Arms DN5 Bolt Action Muzzle Brake - 30 Cal: Designed for calibers that generate additional gas pressures and volume such as 308 Winchester 7MM PRC 7mm Saum and other calibers 308 or smaller Significantly Reduces Recoil while keeping the muzzle down Multiple blast ports redirects propellent gases to counter recoil from the firearm Unique port pattern directs the gas upward forcing the muzzle down Allows the shooter to see trace and bullet impact/misses for more concise follow up shoots 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 Package Contents: Masterpiece Arms Master Piece Arms DN5 Bolt Action Muzzle Brake - 30 Cal This is the 30 Cal version of our tremendously popular Dn5 brake. This version is designed for calibers that generate additional gas pressures and volume such as 308 Winchester 7MM PRC 7mm Saum and other calibers 308 or smaller. 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 63percent reduction in recoil. MQDN5BRAKE30