The Sons of Liberty Gun Works NOX series of muzzle devices blend the line between flash hider and compensator. They provide excellent flash suppression, muzzle climb reduction, and allow the quick installation of suppressors and accessories utilizing the Key Mount pattern. Compatible with Dead Air Armaments Sandman line of suppressors. 3 ports on the 3" 9" and 12 Oclock positions to accommodate left and right handed shooters.Features :5.56/2231/2x283 Prong Muzzle Device9 gas portsFits DAA Suppressor and Key Mount Devices4140 SteelQPQ FinishAmerican Made