Ultradyne Nighthawk Flash Hider 7.62x39mm Black Nitride 416 Stainless. 62x39mm Black Nitride 416 Stainless S the Nighthawk is a birdcage style flash hider engineered to reduce muzzle flash that can impair the eyes night vision in low light. Additionally a solid undercarriage decreases the chance of a dust cloud forming while shooting from a prone position. Nighthawk also reduces muzzle rise which results in faster follow-up shots with increased accuracy. A timing nut is included for easy installation. Specifications for Ultradyne UD11020 Nighthawk Flash Hider 7.62x39mm Black Nitride 416 Stainless S: Manufacturer: Ultradyne Finish: Black Nitride Fabric/Material: 416 Sst Last Chance: Yes