Our .450 Bushmaster Muzzle Brake Compensator is perfect for your AR15 chambered in .450 Bushmaster. Precision machined from carbon steel and finished off in black nitride for a sleek black look, this muzzle brake compensator will look great on your AR15 sporter rifle chambered in .450 Bushmaster. Please ensure your barrel is threaded 5/8-32 TPI thread pitch. Please NOTE, this muzzle brake is NOT for a 5/8-24 TPI barrel it is NOT threaded in 5/8-24 threads. This is for a 5/8-32 TPI threaded barrel only. All our muzzle brakes include a free crush washer for timing your muzzle brake to your rifle.