Ultradyne Athena Linear Compensator 223/5.56 1/2x28 Black. Athena is the most cost-effective way to upgrade a rifle to the Dynamount Sighting System and gives cleaner appearance for sleek look compared to a traditional brake. Like all Ultradyne muzzle devices a timing nut is included for easy installation. Specifications for Ultradyne Athena Linear Compensator: Manufacturer: Ultradyne Color: Black Finish: Salt Bath Nitride Fabric/Material: 416 Stainless Steel Condition: New Features of ATHENA: Optimal Sonic Performance Shrouded Timing Nut Included 416 Stainless Steel with Ultra Rugged SB Nitride Coating Dynamount Compatable Pairs easily with the Dynamount Sighting System Competition Legal Package Contents: Ultradyne Athena Linear Compensator What firearm models does the manufacturer say Ultradyne Athena Linear Compensator is compatible with? The manufacturer suggests that Ultradyne Athena Linear Compensator is compatible with AR-15 AR-10Ultradyne UD10660: Athena Linear Compensator .223/5.56 1/2x28 Black