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Ray, this model has a 4rd Tube Magazine. The SA-20's magazine capacity unplugged is 5 rounds, meaning 4 in the magazine tube and 1 in the chamber. Some sites just list the full capacity of 5rds and add +1 by mistake since Mossberg lists the capacity as 5. --- http://www.mossberg.com/product/mossberg-international-sa-20-railed-pistol-grip-75780/

Mossberg says its a 4+1 Gauge 20 Capacity 5 Chamber 3 Barrel Length 20" Sight Ghost Ring - Fiber Optic Front Choke Cylinder Bore LOP Type Fixed LOP 12.75" Barrel Finish Matte Blued Stock Finish Synthetic (Black Pistol Grip) Weight 5.75 Length 39.5" UPC 884110757807