Perazzi MX3 Special 34" top single barrel. This will fit all square mono block receivers. It will not fit a round mono block receiver such as MX3, MX5, MX7, etc. Overall, this is a very nice barrel with minimal bluing wear. It has been threaded by Wilkinson for his own choke tube system. Included are .024 and .034 choke tubes. The bore measures .742 and the barrel is marked 1.650KGI. $1800 plus $30 to ship.