Manufactured to the highest quality standards and featuring a patent pending design the LANTAC DGNAK47B Muzzle Brake offers improved recoil management and muzzle rise over competitors products. Its unique Short Energy Pulse system reduces length of recoil so that repeating shot energy cannot overlap and knock the shooter off target. Full auto fire is possible with massively reduced recoil and muzzle climb meaning that all shots fall on target.Ultra Fast Attenuation of muzzle blast gasses means that Flash Signature is also reduced. Caliber: 7.62X39mm Material: Hardened Milspec Steel Finish: Nitride Dimensions: L: 2.66'' DIA Body: 0.866'' DIA Fins:0.900'' Weight: 2.8oz Thread: 14X1 L/H Serial Numbered for Quality Control Made in the USA