International Firearm Corporation Maximus. This 12 gauge hunting shotgun features a 28-inch barrel with a capacity of nine rounds, a synthetic stock, and a mossy oak blades finish that covers the entire firearm. This shotgun is perfect for duck season and other fowl while also being perfect as a home defense gun. For the best shotguns for sale. - CHAMBER 12GA 3" - MAGAZINE 3rd or 9rd with magazine extension