The Whisper Suppressor is enhanced by the addition of the .30 Cal 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 features Melonited steel construction and incorporates a suppressor attachment. This brake serves as a powerful initial blast baffle, effectively reducing internal suppressor wear. Even without the suppressor attached, this muzzle brake remains one of the most efficient recoil and muzzle rise reducers on the market. For optimal alignment with your rifle barrel threads, the 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