Precision Reflex .308 Rifle Length Straight Gas Tube Black. Straight tubes are designed for PRi low profile large diameter adjustable gas blocks. The length of the tube is 15.495 Specifications for Precision Reflex .308 Rifle Length Straight Gas Tubes: Manufacturer: Precision Reflex Color: Black Finish: BB Stainless Steel Fabric/Material: Stainless Steel Gas System Length: Rifle Length Gun Make: AR Platform Caliber: .308 Winchester Package Contents: Precision Reflex .308 Rifle Length Straight Gas Tubes Precision Reflex 03-SGT-RL: .308 Rifle Length Straight Gas Tube Black