Bit big but effective - Guntec USA AR .308 Cal Gen 2 Multi Port Compensator

The size was a hair bigger in person, for a .308 i had expected slimmer. The crush washer required more torque than expected, solid material. The real winner is the amount of felt recoil, an AR-10 in .308 doesn't exactly kick bad in the first place but there is a noticeable reduction in both recoil and muzzle rise allowing faster reacquisition on target