Shop › FAXON DUTY BBL 556NATO 16" PENCIL FAXON DUTY BBL 556NATO 16" PENCIL $170.20 Faxon Firearms Duty Series, 1:8 Twist Barrel, 556NATO, 16" Pencil Profile, Mid-Length Gas System, Fits AR-15, Nitride Finish, Black 15A58M16NPQ Quantity: Add To Cart Added! Faxon Firearms Duty Series, 1:8 Twist Barrel, 556NATO, 16" Pencil Profile, Mid-Length Gas System, Fits AR-15, Nitride Finish, Black 15A58M16NPQ