Tiger Rock GTPR GB01-B Assembled .750 Low Profile Micro Gas Block and Sliver Rifle 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. Specifications for Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Rifle Length Gas Tube: Manufacturer: Tiger Rock Color: Black Gas System Length: Rifle Length Gun Make: AR Platform Gun Model: AR-15 Package Contents: Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Rifle 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 Rifle Length Gas Tube is compatible with? The manufacturer says that Tiger Rock Assembled .750 Low Profile Micro Gas Block and Sliver Rifle Length Gas Tube is compatible with AR-15Tiger Rock GTRGB#: GTPR GB01-B Assembled .750 Low Profile Micro Gas Block and Sliver Rifle Length Gas Tube Black Small