Ultradyne Mercury Compensator 223/5.56 1/2x28 Black. 223/5.56 caliber to provide superior recoil reduction and neutralize muzzle rise with a smooth balanced release of blast energy. Progressive 90 degrees side ports vent combusting gases at intervals that spread out the recoil impulse for efficient accurate follow-up shots. Three prongs forward of the bore further enhance stability during operation while simultaneously providing additional flash control. Like all Ultradyne muzzle devices a timing nut is included for easy installation. Specifications for Ultradyne Mercury .223/5.56 Compensator: Manufacturer: Ultradyne Color: Black Caliber: .223 Remington Finish: Black Nitride Fabric/Material: 416 Stainless Steel Threads per Inch: 1/2x28 Gun Model: AR-15 Last Chance: Yes Features of MERCURY: Progressive 90 Degree Ports spread out recoil energy to create a smoother recoil event Shrouded Timing Nut Included 416 Stainless Steel with Ultra Rugged SB Nitride Coating Pairs easily with the Dynamount Sighting System .865 Outside Diameter Competition Legal Package Contents: Ultradyne Mercury .223/5.56 Compensator What firearm models does the manufacturer say Ultradyne Mercury .223/5.56 Compensator is compatible with? The manufacturer says that Ultradyne Mercury .223/5.56 Compensator is compatible with AR-15Ultradyne UD10670: Mercury Compensator .223/5.56 1/2x28 Black