Wilson Combat Rapid Thread Muzzle Brake 9MM/350 Legend 5/8X24 Thread Pitch Melonite Finish Black Includes Shims & O-Ring. The hardened Melonited steel construction in conjunction with the suppressor acts as the initial blast baffle and reduces internal suppressor wear. Specifications for Wilson Combat Rapid Thread Muzzle Brake 9MM/350 Legend 5/8X24 Thread Pitch Melonite Finish Black Includes Shims & O-Ring: Manufacturer: Wilson Combat Color: Black Caliber: 9mm Luger Finish: Black Threads per Inch: 5/8x24 Additional Features: Muzzle Brake Handle Color: Black Features of Wilson Combat Rapid Thread Muzzle Brake 9MM/350 Legend 5/8X24 Thread Pitch Melonite Finish Black Includes Shims & O-Ring: 5/8x24" Package Contents: Wilson Combat Rapid Thread Muzzle Brake 9MM/350 Legend 5/8X24 Thread Pitch Melonite Finish Black Includes Shims & O-Ring