Carlson's Choke Tubes Moss 930 Magazine Extension - 10 Shot Black 10RD. We are the largest and most reputable moss tube company in the world. We decided that the best way to show our love for Mossberg was to make an Magazine Extension that fit's perfect for the moss 930 shotgun. We are so confident in this product that we guarantee all of our customers that the magazine extension will fit perfect and tighter than the original We are proud to say this is one of the best made mag extensions on the market today. Specifications for Carlson's Choke Tubes Moss 930 Magazine Extension: Manufacturer: Carlson's Choke Tubes Color: Black Country of Origin: USA Features of Carlson's Choke Tubes Moss 930 Magazine Extension Mossberg 930 Magazine Extension 8 Shot Package Contents: Carlson's Choke Tubes Moss 930 Magazine Extension barrel clamp plus & spring Carlson's Choke Tubes 04516-10RD: Moss 930 Magazine Extension - 10 Shot Black