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Detachable magazines on pump shotguns have been around for a few years now, but the 590RM takes the idea a real step further. Instead of a long single-stack mag hanging off the receiver, Mossberg developed the first production double-stack magazine for a pump action, so you get 10+1 rounds of 12 gauge without the awkward length that plagued earlier mag-fed shotguns. Reloads are as simple as swapping mags, and the enlarged, beveled loading port with an exposed follower makes topping off quick even with gloves on.
This particular configuration, model 50218, wears an 18.5 inch stand-off barrel with an integrated heat shield built right into the barrel assembly rather than clamped on as an afterthought. The stand-off muzzle gives the gun a purposeful look and keeps your hands protected during fast strings of fire when that barrel starts heating up. It runs a cylinder bore choke and a 2.75 inch chamber, which is right at home with buckshot, slugs, and the full range of standard defensive loads.
Mossberg fans will notice the biggest departure from the classic 500 series right away: an ambidextrous AR-style rotary safety selector that you can flip without breaking your grip. Pair that with the flat profile trigger, which breaks clean and crisp, and the whole gun handles more like a modern carbine than a traditional scattergun. The 5-position adjustable stock with a Magpul MOE pistol grip lets you dial length of pull from 12 to 15.25 inches, and the interchangeable recoil pad plus two QD sling ports mean it adapts to you, not the other way around.
A full-length top Picatinny rail sits on the aircraft-grade aluminum receiver, ready for a red dot or whatever AR-style optic you already trust. The parkerized metal finish shrugs off rough handling and moisture, keeping this shotgun ready for duty use, home defense, or long days at the range. It ships with one 10-round magazine, and Mossberg's higher capacity double-stack mags give you room to grow the setup.
No, the 590RM runs a 2.75 inch chamber, and the double-stack magazines are built around 2.75 inch shells. That covers the vast majority of buckshot, slug, and defensive loads on the market, so for its intended role you won't feel limited. Just skip the 3 inch magnums when stocking up.
The stand-off muzzle is a crenellated extension at the end of the barrel that lets the gun be pressed firmly against a surface without the muzzle slipping or the action being pushed out of position. It also protects the muzzle itself from damage. For most owners it adds a purposeful, duty-style look along with that practical function.
Instead of the classic top-mounted tang safety found on the 500 and standard 590 line, the 590RM uses an ambidextrous AR-style rotary safety selector on the receiver. If you spend time behind an AR, the manual of arms will feel immediately familiar, and you can work the safety without shifting your firing grip. It's one of the defining features of the R-series guns.
Yes, the receiver comes with a top Picatinny rail designed for AR-style optics, so red dots and similar sights mount right up with standard bases. A red dot pairs really well with this platform given the adjustable stock and pistol grip setup. No drilling, tapping, or extra plates needed to get started.
| UPC | 015813502184 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 50218 |
| Action | |
| ATF Type | Shotgun |
| Barrel Length | 18.5" |
| Caliber/Gauge | 12 Gauge |
| Capacity | 10 + 1 |
| Chokes Included | Cylinder Bore |
| Color | PARKERIZED |
| Length | 46.5000 |
| Magazine Included | 1 x 10-Round |
| Model | |
| Number of Magazines | 1 10 rd. |
| Package Height | 3.6 |
| Package Width | 9.1 |
| Product Type | Shotgun |
| Shipping Weight | 10.35 |
| Sights | No Sights |
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