Choate Tool Moss Cruiser 1 Shot Magazine Extension Matte Finish. Comes with spring shell follower and barrel clamp (sling swivel loop pictured is no longer included). The extension is 3 and 1/8 inches long. Specifications for Choate Tool Mossberg Cruiser 1 Shot Magazine Extension: Manufacturer: Choate Tool Finish: Matte Magazine Capacity: 1 Round Condition: New Country of Origin: USA Features of Choate Tool Mossberg Cruiser 1 Shot Magazine Extension: Adds 1 shell Steel construction Base Clamp NOT Included Package Contents: Choate Tool Mossberg Cruiser 1 Shot Magazine Extension Mag extension Mag tube spring High visibility shell follower Choate Tool CMT-02-04-10: Moss Cruiser 1 Shot Magazine Extension Matte Finish