This is a Ultradyne USA Compensator known as the ATHENA chambered in 223 Remington, model UD10660.
ATHENA allows a shooter to inexpensively upgrade their rifle to the Dynamount Sighting System. Muzzle rise has been optimized as well" with gas vented at an angle then forward. This sends a lower percent of sound back towards the shooter" optimizing sonic performance over recoil. Like all Ultradyne muzzle devices" a timing nut is included for easy installation.
Features:
1/2X28 thread pitch
CNC machined
416 stainless steel
Nitride finish
Includes timing nut
