AR-STONER(TM) Gas Tubes are high quality and affordable parts helping your AR-15 or LR-308 function reliably. Made of durable stainless steel, these gas tube are built to strict mil-spec standards and come in a variety of length classes. Make sure your rifle functions flawlessly with an AR-STONER(TM) Gas Tube. Note: Gas tube roll pin is NOT INCLUDED. AR-Stoner Gas Tube -------- Length (inches) Pistol 6.71 Carbine 9.78 Mid-Length 11.76 Rifle 15.16 FeaturesHigh QualityAffordableStainless Steel ConstructionBuilt to Mil-Spec Standards