Description

The Mossberg 590RM is a 12 gauge, magazine‑fed pump‑action shotgun built on the rugged Mossberg 590 platform but updated with modern tactical ergonomics such as a rotary safety, adjustable stock, and detachable box magazine. It’s designed for users who want the reliability of a pump shotgun with the convenience and capacity of detachable magazines instead of a traditional tubular feed.

Specifications

• Model: Mossberg 590RM (magazine‑fed version)
• Type: Pump‑action shotgun
• Gauge: 12 gauge
• Chamber: 2.75″ shotshells
• Barrel Length: ~18.5 inches with integrated heat shield 
• Capacity: 10 + 1 with included detachable double‑stack magazine (standard capacity; mags available in other sizes)
• Action Features:
  • Dual extractors
  • Steel‑to‑steel lockup
  • Twin action bars
  • Anti‑jam elevator
• Safety: Ambidextrous rotary safety selector (AR‑style)
• Trigger: Flat‑profile trigger with smooth break
• Stock: 5‑position adjustable stock with interchangeable recoil pad & QD sling points
• Grip: Magpul MOE pistol grip 
• Forend: Compact, ergonomic forend (user‑serviceable)
• Sights: Magpul MBUS 3 adjustable sights on select models; top Picatinny rail for optics
• Accessory Options:
  • Top Picatinny rail for optics/light mounts
  • Forward M‑LOK adapter for side accessories
• Finish / Color: Matte black synthetic furniture and phosphate‑finished metal
• Length of Pull: Adjustable (approx. 12″ – 15.25″)
• Overall Length: ~36.9 inches
• Weight: ~7.9 lbs unloaded
• Intended Use: Tactical / security / modern pump shotgun role

Design

Detachable Magazine Feed
Unlike traditional pump shotguns fed from a tube, the 590RM uses a double‑stack detachable magazine, allowing faster reloads and higher capacity without a long tube under the barrel. Standard included magazines hold 10 rounds, and other capacities (e.g., 5/15/20 rounds) are available.

Rotary Safety
The ambidextrous rotary safety selector can be operated without breaking grip, inspired by AR‑style controls for ease of access.

Modular Ergonomics
The adjustable stock, MOE grip, Picatinny rail, and optional Magpul MBUS sights support a wide range of setups from optics to lights and lasers.

Modern Tactical Features
With an integrated heat shield, flat trigger, and accessory mounting options, the 590RM blends classic pump reliability with modern customization.

Usage

The 590RM sits between traditional pump shotguns and modern tactical designs. Its magazine feed, adjustable ergonomics, and accessory rails make it appealing for users who want increased capacity, faster reloads, and modular accessories — while retaining the proven mechanics of a Mossberg pump action.