GrovTec US G-COMP Compensator 9mm 1/2X28 Thread Pitch Nitride Finish Black. Specifications for GrovTec US G-Comp Muzzle Compensator: Manufacturer: GrovTec US Color: Black Features of GrovTec US G-Comp Muzzle Compensator Designed To Redirect Propellant Gases And Counter Recoil / Muzzle Rise Machined Steel Package Contents: GrovTec US G-Comp Muzzle Compensator Crush Washer What firearm models does the manufacturer say GrovTec US G-Comp Muzzle Compensator is compatible with? The manufacturer suggests that GrovTec US G-Comp Muzzle Compensator is compatible with UniversalGrovTec US GTHM351: G-COMP Compensator 9mm 1/2X28 Thread Pitch Nitride Finish Black