Mossberg 50219 590M 12 Gauge 10+1 18.50" Tungsten Gray Cerakote Barrel & Steel Drilled & Tapped Receiver, Magpul SGA Safety Orange Synthetic Stock

The Mossberg 590M is a magazine-fed pump-action shotgun built for serious work. This model combines the reliability of Mossberg's legendary 590 platform with modern tactical features: a 10-round detachable magazine system, an optic-ready receiver drilled and tapped for direct mounting, and adjustable ghost ring sights with a fiber optic front post. The 18.5-inch barrel wears a tungsten gray Cerakote finish that stands up to heavy use and corrosion, while the Magpul SGA stock in safety orange is adjustable between 12 and 13 inches of length—letting you dial in the fit that works for your frame and gear. This is a gun that handles like a modern rifle while bringing all the stopping power and versatility of a 12-gauge pump.

Built to run hard, the 590M features dual extractors, steel-to-steel lockup, an ambidextrous safety lever on top, and twin action bars for a smooth, reliable cycle every time. The heavy-walled barrel shoots 2.75-inch rounds in a cylinder bore, and the magazine system is genuinely modular—Mossberg offers 5-, 10-, 15-, and 20-round mags so you can configure capacity to your mission. The magwell has stabilizing ribs that lock the magazine into the receiver with zero wobble, and the optic-ready receiver accepts micro red dots on RMSc footprint mounts. Pull the rear sight plate and you've got a clean platform for a small optic.

Whether you're outfitting a truck for defense, running professional courses, or building a home-security plan, the 590M gives you a proven platform with the ergonomics and modularity modern shooters expect. It's not a service-grade shotgun trying to look tactical—it's a working gun designed from the ground up to be reliable, adaptable, and accurate.

Key Features

• 10-round detachable magazine system with stabilizing ribs for secure lockup
• Optic-ready receiver drilled and tapped for RMSc footprint red dot mounts
• Metal ghost ring rear sight with fiber optic front post; protective low-profile wings
• Tungsten gray Cerakote finish on barrel, receiver, and magazine tube for corrosion and wear resistance
• Magpul SGA synthetic stock in safety orange with adjustable length of pull (12–13 inches)
• Dual extractors and steel-to-steel lockup for reliability
• Top-mounted ambidextrous safety lever
• Twin action bars for smooth pump cycling
• Modular magazine ecosystem: 5-, 10-, 15-, and 20-round capacities available
• Heavy-walled 18.5-inch barrel with cylinder bore choke

Specifications

Frequently Asked Questions

Can I mount a red dot sight on the 590M?

Yes. The receiver is drilled and tapped for RMSc footprint optics. Remove the rear sight plate for a clean mounting surface, and you have a direct platform for small red dots like the Trijicon RMR or Holosun HS507C.

What magazines are compatible with the 590M, and can I change capacity?

The 590M uses detachable box magazines. Mossberg manufactures 5-, 10-, 15-, and 20-round capacities; all lock securely into the receiver using the same magwell interface. You can swap mags to suit your load-out—short mags for close quarters, extended mags for longer sessions.

Does the stock fit different body sizes?

The Magpul SGA stock adjusts from 12 to 13 inches of length of pull. For shooters outside that range or running heavier gear, spacers are available to extend the LOP further.

What ammunition does the 590M shoot?

The 590M is chambered in 12 gauge with a 2.75-inch chamber. It shoots standard 2.75-inch 12-gauge rounds; 3-inch magnum rounds are not compatible. The barrel is cylinder bore, so it delivers consistent patterns with shot of any size you choose.