Carlson's Choke Tubes Beretta A-300 Xtrema/A-400 Xtreme Mag Ext 8 Shot Black. These choke tubes are manufactured from high quality steel and are designed to fit most competing guns. These choke tubes come with both a spring and barrel clamp and are a one piece unit do not require the use of a specialized adapter. The Carlson Magazine Extension for Beretta A-300 Xtrema and Beretta A400 Xtreme is made here in the U.S.A. and carries a lifetime guarantee. Carlson's high quality standard and custom choke tubes are made for serious shooters. All of Carlson's choke tubes are manufactured from high quality bar stock CNC machined for precise fit and easy removal. These chokes are designed to handle the hottest loads from both lead and steel shot as well as the hardest environmental conditions. Specifications for Carlson's Choke Tubes Beretta A-300 Xtrema/A-400 Xtreme Mag Ext: Manufacturer: Carlson's Choke Tubes Color: Black Magazine Capacity: 8 Round Condition: New Country of Origin: USA Features of Carlson's Choke Tubes Beretta A-300 Xtrema/A-400 Xtreme Mag Ext: Beretta A-300 Xtrema/A-400 Xtreme Magazine Extension 8 Shot (Only) Package Contents: Carlson's Choke Tubes Beretta A-300 Xtrema/A-400 Xtreme Mag Ext spring & barrel clamp Carlson's Choke Tubes 04512: Beretta A-300 Xtrema/A-400 Xtreme Mag Ext 8 Shot (Only) Black