Ultradyne Nighthawk Flash Hider AR-15 223/5.56 1/2-28in .875 Outside Diameter416 SS Salt Bath Nitride Black. Additionally a solid undercarriage decreases the chance of a dust cloud forming while shooting from a prone position. The Nighthawk also reduces muzzle rise which results in faster follow-up shots with increased accuracy. Like all Ultradyne muzzle devices a timing nut is included for easy installation. Specifications for Ultradyne Nighthawk Flash Hider .223/5.56: Manufacturer: Ultradyne Color: Black Caliber: 5.56x45mm NATO Finish: Salt Bath Nitride Fabric/Material: 416 Stainless Steel Threads per Inch: 1/2x28 Gun Model: AR-15 Outer Diameter: 0.875 in Weight: 3.7 oz Last Chance: Yes Features of Ultradyne Nighthawk Flash Hider .223/5.56 Minimizes Muzzle Flash Solid Undercarriage Reduces Muzzle Rise 416 Stainless Steel with Ultra Rugged SB Nitride Coating Pairs easily with the Dynamount Sighting System Package Contents: Ultradyne Nighthawk Flash Hider .223/5.56 Shrouded Timing Nut Included What firearm models does the manufacturer say Ultradyne Nighthawk Flash Hider .223/5.56 is compatible with? The manufacturer says that Ultradyne Nighthawk Flash Hider .223/5.56 is compatible with AR-15Ultradyne UD11000: Nighthawk Flash Hider AR-15 .223/5.56 1/2-28in .875 Outside Diameter416 SS Salt Bath Nitride Black