The Whisper Suppressor is made even more powerful with the addition of the .458 Ca flat back Rapid Thread Muzzle Brake. Designed to securely attach to barrels with a diameter greater than 0.775 inches behind their front threads, the Rapid Thread Muzzle Brake is built from Melonited steel for durability and is equipped with a suppressor attachment. This Muzzle Brake serves as a formidable initial blast baffle, significantly minimizing internal suppressor wear. To ensure perfect alignment with your rifle barrel threads, the muzzle brake includes a complete shim set and an O-ring, specifically designed to work seamlessly with Whisper Suppressors. Effectively reduces recoil and muzzle rise Designed to fit barrels with a diameter larger than 0.77 inches behind the front threads Includes a complete shim set and O-ring, specifically designed to work seamlessly with Whisper Suppressors