Beretta Mobile Flush SO-10/486 12 Gauge Choke Tube Improved Modification Silver. 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. Mobil-Choke HP tubes are fully interchangeable on all Beretta barrels that are threaded for Mobil-Choke HP. WARNING: Use of the Mobil HP choke tube in an Mobil firearm (without the HP designation) can cause severe damage to the choke tube and barrel when the shotgun is fired. Specifications for Beretta Mobile Flush SO-10/486 12 Gauge Choke Tube: Manufacturer: Beretta Color: Silver Fabric/Material: Steel Gauge: 12 Choke Tube System: Beretta/Benelli Mobil Gun Make: Beretta Quantity: 1 Package Contents: Beretta Mobile Flush SO-10/486 12 Gauge Choke Tube Beretta C62050: Mobile Flush SO-10/486 12 Gauge Choke Tube Improved Modification Silver