Shop › FAXON DUTY BBL 556NATO 16" GNNR BLK FAXON DUTY BBL 556NATO 16" GNNR BLK $170.20 Faxon Firearms Duty Series, Gunner, 1:8 Twist Barrel, 556NATO, 16", Mid-Length Gas System, Fits AR-15, Nitride Finish, Black 15A58M16NGQ Quantity: Add To Cart Added! Faxon Firearms Duty Series, Gunner, 1:8 Twist Barrel, 556NATO, 16", Mid-Length Gas System, Fits AR-15, Nitride Finish, Black 15A58M16NGQ