Guntec USA AR-10/LR-308 Centurion Flash Hider .308 Cal Black. We accomplished this goal by incorporating a "Double Bubble" design that reduced muzzle rise proportionally to the speed at which the bullet was advancing. The symmetrical design of the device offers the great looks of a "tubeless" design without compromising the function of the device. The design of the Guntec Centurion features four large trapezoidal porting holes which ensures effective gas flow in all weather conditions while the aggressive door breaching spikes are sure to have you shooting fast Specifications for Guntec USA AR-10/LR-308 Centurion Flash Hider: Manufacturer: Guntec USA Color: Nitride Finish: Nitride Fabric/Material: Solid T6 Aluminum Threads per Inch: 5/8x24 Gun Model: AR-10 Length: 1.5 in Projectile Caliber: .308 Caliber Diameter: 0.8 in Features of Guntec USA AR-10/LR-308 Centurion Flash Hider: Recoil Reducing Compensator 5/8 X 24 Thread New Design Just Released Multi Porting Holes Aggressive Door Breacher Spikes Steel Package Contents: Guntec USA AR-10/LR-308 Centurion Flash Hider What firearm models does the manufacturer say Guntec USA AR-10/LR-308 Centurion Flash Hider is compatible with? The manufacturer suggests that Guntec USA AR-10/LR-308 Centurion Flash Hider is compatible with AR-10GUNTEC USA CENT-308: AR-10/LR-308 Centurion Flash Hider