Tiger Rock GTCB GB01-B Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube Black Small. Designed with the minimum profile to fit under nearly any quad rail system it snugly fits standard .750 diameter barrels. The stainless steel provides optimal heat and corrosion resistance and consistent gas flow. Comes Assembled Specifications for Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube: Manufacturer: Tiger Rock Color: Black Gas Block Journal Size-Diameter: .750 in Gas System Length: Carbine Length Gun Make: AR Platform Gun Model: AR-15 Features of Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube Note: Not designed for bull barrel mounts Package Contents: Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube Roll Pin 2 Set Screws Allen Wrench What firearm models does the manufacturer say Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube is compatible with? The manufacturer says that Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube is compatible with AR-15Tiger Rock GTCBGB#: GTCB GB01-B Assembled .750 Low Profile Micro Gas Block and Sliver Carbine Length Gas Tube Black Small