870 Barrel Extension...

Cannot recall what this unit is called; designed by a Russian fellow in N.Dakota. It screws onto any 870 barrel that has choke tubes by removing the choke tube and screwing this into the threads. It makes the barrel 33 and one half inches longer. It is ported and makes the shotgun kick lightly and amazingly quiet. Includes the choke tube designed by the maker. Was bought new and has never fired steel but only a handful of traploads. Designed to shoot ocean-side waterfowl in places where legal but so close to houses that every time you fire a shot somebody calls the police. 12 gauge. $500 or best offer.