Just released from D.I. Optical USA is a series of state-of-the-art muzzle brakes for 5.56mm and 7.62mm rifles 1/2""x28 threads and and 5/8"X24 threads, respectively. Claimed to provide unmatched recoil and flash attenuation, the brakes come with Mil-Std crush washers and can be had in matte natural or blued steel. Contact D.I. Optical at 562-229-1515 (dipoticalusa.com).