Mossberg 590RM 12 Gauge 18.5 in Mag-Fed Shotgun 10-Rd
About this product
The Mossberg 590RM is a magazine-fed pump-action 12-gauge shotgun with an 18.5-inch barrel and 10-round capacity built for tactical applications requiring rapid follow-up shots and modular configuration. This platform combines Mossberg's proven pump-action reliability with modern magazine-fed convenience, featuring aircraft-grade aluminum construction and multiple Magpul components out of the box. Unlike traditional tube-fed shotguns, the 590RM accepts detachable box magazines, allowing for faster reloads and caliber flexibility when configured with appropriate magazines.
What is the Mossberg 590RM used for?
This shotgun is designed for home defense, tactical training, and law enforcement applications where magazine capacity and rapid reloading are operational priorities. The 10-round detachable magazine system allows for faster reloads than traditional tube-fed shotguns, while the 18.5-inch barrel maintains maneuverability in close quarters. The Magpul MBUS 3 sights and top Picatinny rail support optic mounting for improved target acquisition under stress.
How does the Mossberg 590RM compare to the Stevens 555 Sporting O/U 12 Gauge?
The 590RM offers magazine-fed tactical capability while the Stevens 555 provides traditional over-under sporting configuration. The Mossberg delivers 10+1 rounds of rapid fire capability versus the Stevens' two-round limited capacity, making it superior for defensive scenarios but completely unsuitable for clay sports or hunting applications. Where the Stevens excels in break-action reliability and classic handling, the 590RM dominates in ammunition capacity and modular accessory mounting.
What does it weigh and what are the dimensions?
The 590RM weighs 7.8 pounds unloaded and measures 38.5 inches in overall length with the stock fully extended. The 18.5-inch barrel keeps the package compact for vehicle or building clearing operations, while the 1.5-inch magazine width maintains manageable handling characteristics. The five-position adjustable stock allows for length-of-pull adjustments from 12.5 to 14.25 inches to accommodate various body types and armor configurations.
Who is this NOT for?
This shotgun is not suitable for hunters, sport shooters, or those seeking a traditional shotgun experience. The magazine-fed system adds complexity and weight compared to tube-fed designs like the Mossberg 500, and the tactical configuration lacks the refinement needed for competitive shooting or field use. Beginners may find the pump action combined with magazine changes creates a steeper learning curve than simpler break-action shotguns like the Stevens 555 Sporting.
What's in the box?
The package includes the shotgun, one 10-round polymer magazine, Magpul MBUS 3 front and rear sights, and all necessary mounting hardware. Notably absent are additional magazines or a case, requiring separate purchases to achieve operational capacity beyond the initial 10 rounds. The manual includes specific instructions for magazine insertion and removal to prevent feeding issues common with box-mag shotguns.
Is the Mossberg 590RM worth it at $878.99?
At $878.99, this shotgun delivers good value for tactical users requiring magazine-fed capability but represents a premium over standard pump actions. The included Magpul furniture and sights would cost approximately $250 if purchased separately, making the complete package reasonably priced for its feature set. However, additional magazines at $45 each are necessary for practical use, increasing the true system cost to over $950 for a basic operational setup.
Specs at a glance
Video review
Pros & cons
What works
- 10-round detachable magazine capacity — doubles typical tube-fed shotgun round count
- Aircraft-grade aluminum receiver at 7.8 pounds — 1.2 pounds lighter than steel-receiver alternatives
- Magpul MBUS 3 sights included — $120 value added to base package
- 5-position adjustable stock — accommodates 12.5 to 14.25-inch length of pull
Trade-offs
- Magazines cost $45 each — operational readiness requires $135+ in additional magazines
- Proprietary barrel system — limits aftermarket options compared to Mossberg 500 platform
- 2.75-inch chamber only — cannot use 3-inch magnum shells for increased payload
- No included case or additional magazines — barebones package for premium price
Expert review
Key attributes
| upc | 015813502139 |
| manufacturer | Mossberg |
| manufacturer part number | 50213 |
| action | Pump Action |
| atf type | Shotgun |
| barrel length | 18.5" |
| caliber/gauge | 12 Gauge |
| capacity | 10 + 1 |
| chokes included | Cylinder Bore |
| color | PARKERIZED |
| length | 46.1000 |
| magazine included | 1 x 10-Round |
| model | 590 |
| number of magazines | 1 10 rd. |
| package height | 3.7 |
| package width | 9.1 |
| product type | Shotgun |
| shipping weight | 10.8 |
| sights | MBUS 3 Folding Sights |
| sights type | Adjustable Sights |
Frequently asked questions
- Is it compatible with Mossberg 500 barrels?
- No, the 590RM uses a proprietary barrel mounting system due to the magazine feed mechanism. Standard Mossberg 500 barrels will not fit or function properly. Mossberg offers limited aftermarket barrel options specifically for the 590RM series.
- Does it fit standard shotgun cases?
- The 590RM requires a case with minimum interior dimensions of 39x8x3 inches due to its 38.5-inch length and magazine protrusion. Standard 36-inch shotgun cases will not accommodate this firearm without removing the magazine first.
- How long does shipping take to Montana?
- Firearms shipping to FFL dealers in Montana typically takes 3-5 business days for processing and 2-3 days for transit via FedEx. All shipments require signature confirmation at the receiving FFL and cannot be delivered to residential addresses per federal regulations.
- Can I use 3-inch magnum shells?
- No, the 590RM is chambered exclusively for 2.75-inch shells as stated in the specifications. Attempting to fire 3-inch magnum shells may cause dangerous malfunctions and void the warranty. The magazine design physically prevents longer shells from seating properly.
- Does this work with Magpul SGA stocks?
- Yes, the 590RM uses standard Mossberg 500/590 stock mounting patterns and accepts aftermarket stocks including the Magpul SGA series. The factory Magpul MOE pistol grip is removable using a standard 1/2-inch wrench and replacement takes approximately 10 minutes with basic tools.