Griffin Armament Gate-Lok Flash Hider 5.56x45mm NATO 1/2x28 Nitride Black. The Gate-LOK stealth flash hider provides optimal suppressor fit enhanced flash signature reduction and reduces muzzle climb. The focus of the Gen 3 revision was to reduce flash as much as possible. Time intensive R&D resulted in a high performance 3 prong flash hider with incredible resonance reduction. These hide flash extremely well and do not ring or ping when fired. CNC machined and outside diameter ground from heat corrosion and wear resistant precipitation hardened 17-4 stainless steel for maximum durability. Specifications for Griffin Armament Gate-Lok Flash Hider: Manufacturer: Griffin Armament Color: Black Caliber: 5.56x45mm NATO Finish: Nitride Fabric/Material: 17-4 PH Stainless Steel Threads per Inch: 1/2x28 Length: 2.25 in Weight: 2.4 oz Package Contents: Griffin Armament Gate-Lok Flash Hider Griffin Armament XHP556FH3P: Gate-Lok Flash Hider 5.56x45mm NATO 1/2x28 Nitride Black