Carlson's Choke Tubes Nova/Super Nova 12GA Shotgun Barrel 18 1/2in. w/Cylinder. These Shotgun Barrels from Carlson's Choke Tubes are constructed with ordinance grade 4140 steel and have chrome lining for smooth firing. Carlson's Nova/Super Nova 12ga Shotgun Barrel Replacements come with reliable Carlson's choke tubes already installed. A durable Carlson's Nova/Super Nova 12ga Replacement Shotgun Barrel will enhance your accuracy. Specifications for Carlson's Choke Tubes Nova/Super Nova 12GA Shotgun Barrel: Manufacturer: Carlson's Choke Tubes Gauge: 12 Condition: New Features of Carlson's Super Nova/Nova 12ga Shotgun Barrel: All models come with Carlson choke tubes installed. Rifled choke tube models made from 304 high stress stainless steel. Other choke tubes made from 17-4 stainless steel. Vent rib models have a satin matte blue finish with red fluorescent front sight and brass center bead. All 18 1/2 inch barrels are non vent ribbed and have a ramped front sight with a matte finish. Threaded for the Benelli Mobil choke style system. 12 gauge only. Package Contents: Carlson's Choke Tubes Nova/Super Nova 12GA Shotgun Barrel wrench Carlson's Choke Tubes 87014: Ben Nova & S-Nova Barrel 18 1/2in. w/Cylinder