BERETTA OPTIMACHOKE HIGH PERFORMANCE 50MM EXTENDED 12GA BURNISHED CHOKE TUBES Beretta Optima-Choke HP tubes stand up to the heat of competition. Manufactured from high strength steel and finished in a nickel-alloy coating, these chokes guarantee significant corrosion resistance and have the ability to withstand the rigors of steel shot. Optima-Choke HP tubes are fully interchangeable on all Beretta barrels that are threaded for Optima-Choke HP. FEATURES: - Choke Tube Series: Optimachoke HP - Choke Tube Type: Extended - Gauge: 12 Gauge - Material: Steel OPTIMA-CHOKE HP NEW LEGACY With the introduction of the SV-10 Perennia and Prevail Series Over&Under guns in 2008 a third Optima-Bore choke configuration was added, the Optima-Choke HP. As noted above under the Optima-Choke Plus section, the extended use of high performance steel and metal alloy non-toxic shot imparts considerable stresses. In the case of the Optima-Choke Plus part of the solution was to use a choke tube design offering a thicker choke tube wall to better resist these forces. This in turn results in a heavier, larger diameter barrel.One of the principal objectives in designing the Optima-Choke HP (OB HP) system was to develop a choke tube system that would withstand the rigors of the extended use of heavy payloads of steel/metal alloy shot while being able to retain the weight saving and handling characteristics of the lighter Optima-Choke barrel contour.At today (2018), all new Beretta guns are made to use the Optima-Choke HP chokes, as they represent the most advanced technological solution to every need the shooter may face.