I have a K80 32" step rib O/U barrel that is non ported and has factory chokes. Bluing is very good and has the 12 X 8 mm rib. Barrel comes with 2 titanium chokes or can put 2 new steel chokes in for less money. (( $2400 Delivered with 2 titanium chokes to your address in the Lower 48 )) Any questions please send a conv message for info and contact # -- Thanks Bob