Ultradyne Pegasus Compensator Muzzle Brake AR-15 223/5.56 1/2-28in 1.36in Outside Diameter 416 SS Salt Bath Nitride Black. 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. Specifications for Ultradyne Pegasus Compensator .223/5.56: Manufacturer: Ultradyne Color: Black Caliber: 5.56x45mm NATO Finish: Salt Bath Nitride Fabric/Material: 416 Stainless Steel Threads per Inch: 1/2x28 Gun Model: AR-15 Outer Diameter: 1.36 in Weight: 6.7 oz Condition: New Features of Ultradyne Pegasus Compensator .223/5.56 Progressive 90 Degree Ports spread out recoil energy to create a smoother recoil event Eliminates Muzzle Rise Tanker-Style Design 416 Stainless Steel with Ultra Rugged SB Nitride Coating Pairs easily with the Dynamount Sighting System Package Contents: Ultradyne Pegasus Compensator .223/5.56 Shrouded Timing Nut Included What firearm models does the manufacturer say Ultradyne Pegasus Compensator .223/5.56 is compatible with? The manufacturer suggests that Ultradyne Pegasus Compensator .223/5.56 is compatible with AR-15Ultradyne UD11010: Pegasus Compensator Muzzle Brake AR-15 .223/5.56 1/2-28in 1.36in Outside Diameter 416 SS Salt Bath Nitride Black