Beretta Optimachoke HP Flush 12 Gauge Choke Tube Nickel Alloy Full. Manufactured from high strength steel and finished in a nickel-alloy coating these Beretta chokes guarantee significant corrosion resistance and have the ability to withstand the rigors of steel shot. The Beretta OptimaChoke HP Tubes are fully interchangeable on all Beretta barrels that are threaded for Optima-Choke HP. WARNING: Use of the Beretta Choke for Optima HP 12 Gauge in an Optima firearm (without the HP designation) can cause severe damage to the choke tube and barrel when the shotgun is fired. Only use Optima HP choke tubes in these Optima HP shotguns: SV10 Perennia SV10 Prevail A400 Xplor and UGB25 Sporting. Specifications for Beretta OptimaChoke HP Flush 12 Gauge Choke Tube: Manufacturer: Beretta Color: Silver Finish: Nickel Alloy Fabric/Material: Steel Gauge: 12 Choke Tube System: Beretta Optima HP Gun Make: Beretta Gun Model: Universal Condition: New Package Contents: Beretta OptimaChoke HP Flush 12 Gauge Choke Tube Beretta C62070: Optimachoke HP Flush 12 Gauge Choke Tube Nickel Alloy Full