Shop › CMMG GAS TUBE KIT RIFLE W/PIN CMMG GAS TUBE KIT RIFLE W/PIN $19.95 CMMG Gas Tube Kit, Rifle Length Gas Tube and 5/64"x5/16" Roll Pin, Fits Rifle, Stainless Finish 55DA196 Quantity: Add To Cart Added! CMMG Gas Tube Kit, Rifle Length Gas Tube and 5/64"x5/16" Roll Pin, Fits Rifle, Stainless Finish 55DA196