Ultradyne USA PEGASUS Brake, 762NATO/308 Winchester, Fits AR-10s with 5/8X24 Threads, Black, 4.6 oz., 416 Stainless Steel, Includes Shrouded Timing Nut UD10700 PEGASUS has been meticulously engineered to provide superior recoil reduction and neutralize muzzle rise with a smooth" balanced release of blast energy in a tanker-style compensator. Progressive 90 side ports vent combusting gases at intervals that spread out the recoil impulse for efficient" accurate follow-up shots. Like all Ultradyne muzzle devices" a timing nut is included for easy installation.