GrovTec US G-Nite .223 Flash Hider .223 Caliber 1/2x28 Thread Nitride Black. Some local state or federal laws may apply to this product in your area. Specifications for GrovTec US G-Nite Flash Hider: Manufacturer: GrovTec US Color: Black Finish: Nitride Fabric/Material: Machined steel Gun Make: Universal Gun Model: Universal Gun Type: Rifle Package Contents: GrovTec US G-Nite Flash Hider Crush Washer What firearm models does the manufacturer say GrovTec US G-Nite Flash Hider is compatible with? The manufacturer suggests that GrovTec US G-Nite Flash Hider is compatible with UniversalGrovTec US GTHM317: G-Nite .223 Flash Hider .223 Caliber 1/2x28 Thread Nitride Black