LANTAC DGN762B-ASR™ Dragon® Advanced Muzzle Brake with SilencerCo™ ASR Quick Mount Suppressor Adapter. – The DGN762B-ASR™ is precision machined hardened to 48Rc and nitride finished for enhanced corrosion resistance. – It features our patented gas handling system that reduces muzzle rise and recoil to zero meaning that the only recoil felt by the shooter is from the movement of the carrier and buffer within the buffer tube. – 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. – With the addition of the SilencerCo ASR quick mount system it is now possible to mount the SilencerCo Saker Omega Suppressors and the Blast Shield. – The DGN762B-ASR™ Brake/ Mount is threaded 5/8 X 24 and is designed to be used with 7.62/308 Caliber ammunition only. – Comes with appropriate shim set for timimg the brake / mount. X2 .34mm X3 .22mm X3 .11mm X4 .075mm & x1 2mm Washer.