Our .50 Beowulf Muzzle Brake Compensator is perfect for your AR rifle chambered in .50 Beowulf or 12.7x42mm. Both calibers are essentially the same, and so long as your barrel is threaded 49/64-20 threads per inch, it’ll work well for your Alexander Arms barrel or any other manufacturer. 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 big boy rifle. Please ensure your barrel is threaded 49/64-20 thread pitch. All our muzzle brakes include a free crush washer for timing your muzzle brake to your rifle.