Arc Division Sparc V2 Pistol Compensator 9mm Gen 4 .5x28 Anodized Black. The Sparc will help you shoot flatter and faster in all situations. We offer our comp threaded in the standard 1/228 threaded barrels. Specifications for Arc Division Sparc V2 Pistol Compensator: Manufacturer: Arc Division Color: Black Fabric/Material: 7075 Aluminum Threads per Inch: 1/2x28 Gun Make: Glock Condition: New Projectile Caliber: .355 Caliber Fit: Glock Features of Arc Division Sparc V2 Pistol Compensator Square back Double top port compensator Package Contents: Arc Division Sparc V2 Pistol Compensator Threadlocker Allen Key Set Screws Instruction Sticker What firearm models does the manufacturer say Arc Division Sparc V2 Pistol Compensator is compatible with? The manufacturer suggests that Arc Division Sparc V2 Pistol Compensator is compatible with Glock 43 Glock 19 Glock 17Arc Division 45921: Sparc V2 Pistol Compensator 9mm Gen 4 .5x28 Anodized Black