MX8(Mirage) O/U, type four barrel only. Serial #51324. Wilkinson tuned and stamped so on the flat underside of the breech end. bore is .735. Bottom barrel is .710(.025)Improved modified. Top barrel is .699(.036)full. These are bunker or pigeon barrels. Barrel length is 28.25". Barrel weight is 1.40KG. Has side ribs. Tapered rib(8.2x11mm) that is slightly stepped. Fast swinging. excellent shape. Bonus. Comes with full length Briley 28ga. tubes that have four screw in choke tubes. Includes the tool to tap in and out of the barrels. Also has a green Perazzi barrel case. All for $1600.00. call or email Jim Veta. cell phone is . email is . Thank you.