Shop › FN BBL M16 BB 10.5" CARB LENGTH 556 FN BBL M16 BB 10.5" CARB LENGTH 556 $279.00 FN America Barrel, 10.5", 556NATO, 1:7 Twist, Button Broached, Carbine Gas System, M16 Contour, Fits AR-15, Matte Finish, Black 20-100037 Quantity: Add To Cart Added! FN America Barrel, 10.5", 556NATO, 1:7 Twist, Button Broached, Carbine Gas System, M16 Contour, Fits AR-15, Matte Finish, Black 20-100037