Aero Precision .936 Low Profile Gas Block AR15/AR 308 Black Nitride. 936 AR15/AR 308 Black Nitride - Aero's gas blocks create an efficent and reliable gas system for your AR15 or AR 308 rifle build. Features fits barrels with .936 outer diameter low profile for easy fitment and set screws are steel 10-32 x 3/16 knurled cup point. Note - Roll pin not included. We do not recommend the use of red thread locker on the threads of the set screws. If you decide to use thread locker we recommend using the non permanent variety. Specifications for Aero Precision .936 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: .936 in Gun Make: AR Platform Gun Model: AR308 AR-15 Weight: 1.6 oz Condition: New Country of Origin: USA Finish: Black Nitride Package Contents: Aero Precision .936 Low Profile Gas Block AR15/AR 308 Black Nitride What firearm models does the manufacturer say Aero Precision .936 Low Profile Gas Block AR15/AR 308 Black Nitride is compatible with? The manufacturer says that Aero Precision .936 Low Profile Gas Block AR15/AR 308 Black Nitride is compatible with AR-15 AR308Aero Precision APRH101207C Low Profile Gas Block .936 AR15/AR 308 Black Nitride