I have a Perazzi DB81 Top Single 34" barrel that has Briely S - 18 thin wall chokes. Comes with a 20th - 30th and a 35th . Bore as I read it is 745 and the barrel is ported.and looks like Pro Port. There is a screw on recoil reducer on barrel which can be removed and a lighter on installed. Bluing is good and the middle bead has been moved ahead about 4" . Ser # 64782 (( $1500 delivered to your address in the lower 48 )) Any questions please send a conv message for info and contact # -- Thanks Bob