Arc Division Sparc M V1 Pistol Compensator .40 9/16x24 Anodized Black. The Sparc-M will help you shoot flatter and faster in all situations. We offer our comp threaded in the standard 1/228 and 13.5x1 LH for Glock factory threaded barrels and 9/16x24 for .40Cal. Specifications for Arc Division Sparc M V1 Pistol Compensator: Manufacturer: Arc Division Fabric/Material: 7075 Aluminum Gun Make: Glock Length: 1 in Weight: 0.7 oz Condition: New Fit: Glock Features of Arc Division Sparc M V1 Pistol Compensator Square Single top port compensator No guiderod cover Package Contents: Arc Division Sparc M V1 Pistol Compensator Threadlocker Allen Key Set Screws Instruction Sticker Arc Division 52116: Sparc M V1 Pistol Compensator .40 9/16x24 Anodized Black