Shop › SANTAN AR15 GAS TUBE NTRD MID LNGTH SANTAN AR15 GAS TUBE NTRD MID LNGTH $20.00 sold out San Tan Tactical Gas Tube Mid Length, Black Nitride Coated, Gas Tube Kit with Pin STT-GT-M Sold Out Added! San Tan Tactical Gas Tube Mid Length, Black Nitride Coated, Gas Tube Kit with Pin STT-GT-M