Kaw Valley Precision AR-15 Standard Gas Block .625 Black Small. KVP Gas Blocks feature a threaded gas tube retention pin that eliminates the installation awkwardness surrounding tiny gas tube roll pins Specifications for Kaw Valley Precision AR-15 Standard Gas Block: Manufacturer: Kaw Valley Precision Color: Black Fabric/Material: Steel Package Contents: Kaw Valley Precision AR-15 Standard Gas Block What firearm models does the manufacturer say Kaw Valley Precision AR-15 Standard Gas Block is compatible with? The manufacturer says that Kaw Valley Precision AR-15 Standard Gas Block is compatible with AR-15Kaw Valley Precision KVP-GB-625: AR-15 Standard Gas Block .625 Black Small