I have a set of Perazzi factory extended chokes for an 18.7 bore barrel. There are 5 chokes , 2 - 4 - 6 - 8 - 10 , choke wrench and case included. The #8 has been used and the others have not. (( $200 Delivered to your address in the Lower 48 )) Any questions please send a conv message for info and contact # -- Thanks Bob