Mossberg 590RM | 12ga | 18.5in | 10+1 | MFG# 50218

The Mossberg 590RM is a tactical 12 gauge pump-action shotgun built around a magazine-fed system and a compact 18.5″ stand-off barrel with an integrated heat shield. It uses a rotary safety selector and a 5-position adjustable synthetic stock with a Magpul MOE pistol grip for ergonomic control. The design places emphasis on modularity and practical use in security and tactical training environments. Top Picatinny rail and MBUS sights provide mounting and sighting options for a variety of setups.

Product Specifications

• The manufacturer is Mossberg.
• The model is 590RM.
• The gauge is 12 Gauge.
• The barrel measures 18.5 inches.
• The action type is pump-action.
• The chamber accepts 2.75 inch shells.
• The product includes 1 × 10‑round magazine.
• The nominal capacity is 10+1 rounds.
• The stock is a 5-position adjustable synthetic tactical stock with a Magpul MOE pistol grip.
• The barrel features a stand-off integrated heat shield.
• The shotgun includes a Picatinny top rail and Magpul MBUS sights.
• The receiver is aircraft-grade aluminum.
• The installed choke is a cylinder bore (Accu-Choke system).
• The action is drilled and tapped for optics.
• The UPC is 015813502184.

Compact and feature-rich, the 590RM is aimed at users who need a robust, magazine-fed pump shotgun with adjustable ergonomics and accessory options. Its combination of a short stand-off barrel, integrated heat shield, rotary safety selector, and a top rail for sights makes it well suited to security applications and practical/tactical training where a compact, modular platform is required.