LanTac USA LLC Drakon Muzzle Break, 14-1 LH Thread Pitch, 7.62x39, Nitride Finish, Black DGNAK47B-ASR LANTAC Dragon Muzzle Brake DGNAK47B for AK47 Rifles & Variants. Manufactured to the highest quality standards and featuring a patent pending design, the LANTAC Drakon Muzzle Brake offers improved recoil management and muzzle rise over competitors products.