Shop › SANTAN AR15 GAS TUBE NTRD RFL LNGTH SANTAN AR15 GAS TUBE NTRD RFL LNGTH $20.00 San Tan Tactical Gas Tube Rifle Length, Black Nitride Coated, Gas Tube Kit with Pin STT-GT-R Quantity: Add To Cart Added! San Tan Tactical Gas Tube Rifle Length, Black Nitride Coated, Gas Tube Kit with Pin STT-GT-R