Beretta Choke Tube Optimachoke HP Black Edition 20mm Extended 12 Ga Black Modified. 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. 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 Choke Tube Optimachoke HP Black Edition 20mm Extended 12 Ga: Manufacturer: Beretta Color: Black Finish: Blued Fabric/Material: Stainless Steel Gauge: 12 Choke Tube System: Beretta Optima HP Gun Make: Beretta Gun Model: Universal Quantity: 1 Condition: New Package Contents: Beretta Choke Tube Optimachoke HP Black Edition 20mm Extended 12 Ga Beretta C6A235: Choke Tube Optimachoke HP Black Edition 20mm Extended 12 Ga Black Modified