The ability of certain Mossberg 590 shotguns to chamber and fire shorter 1.75-inch shells, often referred to as “mini-shells,” significantly alters the firearm’s total ammunition capacity. This adaptation allows for a greater number of rounds to be loaded into the magazine tube compared to standard 2.75-inch shells, enhancing the shotgun’s defensive or sporting potential.
This increased capacity offers a tactical advantage in situations where rapid firing and high shell count are critical. Historically, shorter shells were often associated with reduced recoil and lighter weight, making them popular among smaller-framed shooters. However, the modern adaptation to the 590 platform focuses on maximizing ammunition capacity while maintaining the effectiveness of the 12-gauge platform. The option to use these smaller shells broadens the 590s versatility and appeal to a wider range of users.