Ultradyne Lithium PCC Compensator Muzzle Brake 9mm 1/2-28 Thread 1.124in Outside Diameter 416 SS Salt Bath Nitride Black. This results in faster follow-up shots with increased accuracy. The gases are strategically vented so they do not obscure the sight path or travel back towards the shooter. Like all Ultradyne muzzle devices a timing nut is included for easy installation. Specifications for Ultradyne Lithium PCC Compensator Muzzle Brake 9mm: Manufacturer: Ultradyne Color: Black Caliber: 9mm Luger Finish: Salt Bath Nitride Fabric/Material: 416 Stainless Steel Threads per Inch: 1/2x28 Gun Model: AR-15 Outer Diameter: 1.124 in Weight: 4 oz Condition: New Features of Ultradyne Lithium PCC Compensator Muzzle Brake 9mm Drastically reduces muzzle rise Aggressive Comp Ports Gases directed out of the shooters line of sight Pairs easily with the Dynamount Sighting System 416 Stainless Steel with Ultra Rugged SB Nitride Coating Package Contents: Ultradyne Lithium PCC Compensator Muzzle Brake 9mm Shrouded Timing Nut Included What firearm models does the manufacturer say Ultradyne Lithium PCC Compensator Muzzle Brake 9mm is compatible with? The manufacturer suggests that Ultradyne Lithium PCC Compensator Muzzle Brake 9mm is compatible with AR-15Ultradyne UD11030: Lithium PCC Compensator Muzzle Brake 9mm 1/2-28 Thread 1.124in Outside Diameter 416 SS Salt Bath Nitride Black