SADLAK Adjustable Low Profile Gas Block .750 Bore Diameter Black Medium. 750 Bore Diameter Steel Manganese Phosphate with Fine thread adjustment screw for precision adjustment. Specifications for SADLAK Adjustable Low Profile Gas Block: Manufacturer: SADLAK Color: Black Coating: Manganese Phosphate Fabric/Material: Steel Gun Make: Universal Gun Model: AR-15 Condition: New Gas Block Journal Size-Length: 0.95 in Features of SADLAK Adjustable Low Profile Gas Block All of SADLAKs Gas Blocks are made in specialized factories by craftsmen with years of experience delivering consistent quality. All the bores are precision honed and all critical measurements are 100percent inspected to insure consistancy and quality. Package Contents: SADLAK Adjustable Low Profile Gas Block What firearm models does the manufacturer say SADLAK Adjustable Low Profile Gas Block is compatible with? The manufacturer suggests that SADLAK Adjustable Low Profile Gas Block is compatible with AR-15SADLAK GB107AJ: Adjustable Low Profile Gas Block .750 Bore Diameter Black Medium