The Mossberg 590M is the magazine-fed member of the 590 family, and it exists to solve the shotgun's oldest weakness: reloading under pressure. Swapping a box magazine is dramatically faster than thumbing shells into a tube, which is why the design appeals to home-defense and competition users alike.

This is a factory Mossberg 20-round drum magazine in 12 gauge, built with a double-stack geometry and a steel feed lip area to hold up to repeated loading. It drops in and locks up the same as the smaller capacity units.

In stock and ready to ship straight to your door from Dawson Defense, an Arizona-owned licensed dealer.