Ultradyne USA ATHENA, Compensator, 350 Legend, 1/2X28, Black UD11210 The Athena is Ultradyne's linear compensator. Muzzle rise has been optimized" with gas vented at an angle then forward. This sends a lower percent of sound and gasses back towards the shooter" optimizing sonic performance over recoil. Athena gives a cleaner appearance for a sleek look compared to traditional brakes and is the most cost-effective way to upgrade a rifle to the Dynamount Sighting System. Like all Ultradyne muzzle devices" a timing nut is included for easy installation.