Ultradyne Athena 350 Linear Compensator .625x24. 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 ( Crush washer for the .350 caliber). Specifications for Ultradyne Athena 350 Linear Compensator: Manufacturer: Ultradyne Projectile Caliber: .357 Caliber Threads per Inch: 5/8x24 Color: Black Caliber: .350 Legend Last Chance: Yes Features of Ultradyne Athena 350 Linear Compensator Vents Gases forward Timing nut included for easy installation and indexing Indexing slots compatible with the Dynamount Front Sight allow for a standard upright alignment or a 45 degree offset 100percent CNC-machined quality Package Contents: Ultradyne Athena 350 Linear Compensator Ultradyne UD10856: Athena 350 Linear Compensator .625x24