USED Beretta Choke Tube OptimaChoke HP +3/4in 12GA Nickel Alloy Improved Cylinder. 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. These choke tubes are designed for 12 gauge shotguns with the optimachoke HP system. WARNING: Use of the Optima HP choke tube in an Optima firearm (without the HP designation) can cause severe damage to the choke tube and barrel when the shotgun is fired. Specifications for Beretta OptimaChoke HP +3/4in 12GA Choke Tube: Manufacturer: Beretta Color: Silver Finish: Nickel Alloy Fabric/Material: Steel Gauge: 12 Choke Tube System: Beretta Optima HP Gun Make: Beretta Quantity: 1 Package Contents: Beretta OptimaChoke HP +3/4in 12GA Choke Tube Beretta C62181: Choke Tube OptimaChoke HP +3/4in 12GA Nickel Alloy Improved Cylinder