The Ultradyne AR .308 Pegasus Compensator is an advanced muzzle device that provides super-smooth recoil reduction with minimal shooter distraction. The AR .308 Pegasus utilizes a tanker-style form factor, four progressive 90 degree side ports vent combusting gases at intervals that spread out the recoil impulse for efficient, accurate follow-up shots. CNC machined stainless steel with ultra-rugged salt bath nitride finish Barrel threads" 5/8-24 UNEF-2B Mounts with shrouded timing nut Weighs 5.7 ounces 2.43" long, 1.36" outer diameter Rated for .308/7.62x51 ammunition Mfg: Ultradyne Usa