Mossberg 590M Magazines

The Mossberg 590M gives pump-action shotgun owners a faster, cleaner way to reload. Instead of feeding shells into a tube one at a time, the 590M shotgun uses detachable 12-gauge magazines that lock into the shotgun from below. That design gives shooters faster reloads, higher capacity, and a more efficient setup for range use and defensive training.

The Mag Shack offers Mossberg 590M magazines for shooters who want dependable feeding and the correct fit for this unique platform. The collection includes 5, 10, 15, and 20-round options, giving you several ways to configure your Mossberg mag-fed shotgun to your needs.

Mossberg 590M Magazine Capacities: 5, 10, 15, and 20 Rounds

The Mossberg 590M magazine lineup gives shooters more capacity than a standard tube-fed pump shotgun. Each magazine serves a different role, so the best choice depends on how you plan to use your shotgun.

Mossberg 590M 5 Round Magazine

The 5-round magazine is a practical option for hunting, range restrictions, and areas with magazine-capacity limits. It keeps the shotgun lighter and easier to carry while preserving the detachable-magazine design that defines the 590M platform.

Mossberg 590M 10 Round Magazine

The Mossberg 590M 10-round magazine is the most compact high-capacity option in the collection. It offers a useful increase over most tube-fed shotguns while keeping the shotgun easier to handle. For many owners, the 10-round magazine is the best option suitable for training and general shooting.

Mossberg 590M 15 Round Magazine

The Mossberg 590M 15-round magazine adds 5 more rounds in a taller magazine body. The 15-round magazine is popular for tactical applications and shooters who want more capacity without the bulk of a 20-round magazine. It extends further below the receiver than the 10-round, but is still manageable for most shooting positions.

Mossberg 590M 20 Round Magazine

The Mossberg 590M 20-round magazine is the largest factory option for the platform and one of the main reasons shooters search for the 590M. This magazine gives a pump shotgun a level of onboard ammunition that tube-fed models cannot match. The Mossberg 590M 20-round magazine has a larger footprint and adds noticeable weight when loaded, but it delivers serious capacity for a 12-gauge pump-action shotgun.

How the 590M Magazine System Works

The 590M magazine system changes how a pump shotgun reloads. A standard pump-action shotgun stores shells in a tubular magazine under the barrel. The shooter loads each shell by hand through the loading port, a process that takes time and requires fine motor control.

The Mossberg 590M uses a detachable double-stack magazine. You insert the magazine into the magazine well from below, similar to a rifle magazine. Once it locks in place, the shotgun feeds from the magazine as you cycle the pump.

Reloading is simple. Press the magazine release, remove the empty magazine, insert a loaded magazine, and cycle the action as needed. This process is much faster than topping off a tube magazine shell by shell. For competitive shooters, home defenders, and anyone who has struggled with the slow reload of a tube-fed pump, the 590M solves the problem entirely.

The system also gives shooters a simple way to organize different loads. For example, one magazine can hold buckshot for defensive training, while another can hold slugs for range work. Always follow safe handling practices and confirm the correct ammunition for your shotgun before loading.

Mossberg 590M vs Standard 590: What’s the Difference?

The standard Mossberg 590 and the Mossberg 590M share the same pump-action heritage, but their feeding systems are different.

The standard 590 uses a fixed tubular magazine. Depending on the model, it usually holds fewer rounds than the 590M and reloads one shell at a time. This setup is simple and familiar.

The 590M shotgun uses detachable box magazines. That gives it faster reloads and higher-capacity options, including the Mossberg 590M 10-round magazine, 15–round magazine, and 20-round magazine.

The 590M also has a different lower receiver area to accept the magazine well. Because of that design, Mossberg 590M magazines do not work in a standard Mossberg 590, 590A1, 500, or Maverick 88.

Many external accessories may share similar fitment across the broader Mossberg family, but magazines are platform-specific. Check compatibility before ordering.

590M Magazine Compatibility

Mossberg 590M magazines are designed exclusively for the 590M platform. They will not fit any other Mossberg shotgun, including the standard 590, 590A1, 500, or Maverick 88. There are no aftermarket 590M magazines. Mossberg factory OEM magazines are the only option available. When purchasing, make sure you are buying 590M-specific magazines.