Check the listing for details. DELTAC® "Backfire" muzzle brake for 1/2-28RH. Condition: New. Listed at 45.99 USD. Description: Designed for tactical applications that require minimal dust signature. A massive symmetrical blast baffle, redirect gas to the rear and upward delivering unparalleled recoil reduction while also minimizing muzzle rise and ground disturbance. High tolerance threads machined in same operation as bore aperture ensures perfect concentricity. Computer FEA optimized for maximum strength to weight ratio and impact survivability. Precision CNC machined from high strength steel bar for superior heat and corrosion resistance.Effectively reduce muzzle rise and recoil. Type: Muzzle Brake Length: 2.520 inches Caliber: 7.62 Exit hole .340 inches Thread: 1/2-28RH thread.- all steel construction. NOTE: This device should be installed by a competent gunsmith to ensure concentricity and clearance at exit hole. Machined from top quality steel and finished in black oxide.