DoubleStar Adjustable Low Profile Gas Block .750in Black. .750"Machined from 1045 Steel. Stainless Adjustment Screw with brass locking screw to prevent damage to the threads. Self tapping set screws on the bottom for perfect seal and fit to barrel. Perfect for competition shooters. Specifications for DoubleStar Adjustable .750in Low Profile Gas Block: Manufacturer: DoubleStar Color: Black Fabric/Material: 12L14 Steel 1045 Steel Gas Block Journal Size-Diameter: .750 in Size: One Size Gun Make: AR Platform Gun Model: AR-15 Condition: New Features of Doublestar Adjustable Low Profile Gas Block .750in Adjustable Low Profile Gas Block Size: .750" Finish: Nitride Package Contents: DoubleStar Adjustable .750in Low Profile Gas Block What firearm models does the manufacturer say DoubleStar Adjustable .750in Low Profile Gas Block is compatible with? The manufacturer suggests that DoubleStar Adjustable .750in Low Profile Gas Block is compatible with AR-15DoubleStar DSC766: Adjustable Low Profile Gas Block .750in Black