Aero Precision Low Profile Gas Block .750 AR15/AR 308 Black Nitride. Specifications for Aero Precision .750 Low Profile Gas Block AR15/AR 308 Black Nitride: Manufacturer: Aero Precision Color: Black Coating: Nitride Fabric/Material: 4140 hardened steel Gas Block Journal Size-Diameter: .750 in Gun Make: AR Platform Gun Model: AR308 AR-15 Weight: 1.6 oz Condition: New Country of Origin: USA Finish: Black Nitride Features of Aero Precision .750 Low Profile Gas Block AR15/AR 308 Black Nitride: Fits barrels with .750 Outer Diameter Constructed from 4140 hardened steel Choose No Aero Logo or Aero inAin Logo blocks Low profile for easy fitment Set Screws are Steel 10-32 x 3/16 Knurled Cup Point Package Contents: Aero Precision .750 Low Profile Gas Block AR15/AR 308 Black Nitride What firearm models does the manufacturer say Aero Precision .750 Low Profile Gas Block AR15/AR 308 Black Nitride is compatible with? The manufacturer says that Aero Precision .750 Low Profile Gas Block AR15/AR 308 Black Nitride is compatible with AR-15 AR308Aero Precision APRH101205C Low Profile Gas Block .750 AR15/AR 308 Black Nitride