Mossberg 590RM Standoff 12 Gauge Pump-Action Shotgun, 18.5 Inch, Magazine-Fed, Parkerized, 3x 10-Round Mags
The Mossberg 590RM Standoff is a magazine-fed, full-size 12 gauge pump introduced in January 2025, built in the United States and engineered around double-stack detachable box magazines. This Standoff configuration adds a factory ported breacher muzzle device and an integrated one-piece heat shield, paired with a 5-position adjustable stock and Magpul MOE+ pistol grip. It includes three 10-round magazines for a 10+1 capacity and measures approximately 37 inches overall at about 7.9 lb per factory specification.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: Minor scratches and small blemishes are present on the exterior surfaces.
What’s Included
- Mossberg 590RM Standoff 12 Gauge pump-action shotgun
- Three 10-round Mossberg factory 590M double-stack detachable box magazines (Mossberg-branded)
This 590RM uses Mossberg’s detachable, double-stack box magazines for fast reloads and a 10+1 capacity with the included 10-round mags. It is chambered for 2.75 inch shells and features an 18.5 inch barrel, delivering a compact duty-length package that remains nimble and straightforward to run.
The Standoff configuration is factory-equipped with a ported breacher muzzle device and an integrated one-piece heat shield. A bead front sight on a pedestal provides a durable, easy-to-reference aiming point, and the Parkerized finish on the receiver and barrel offers a uniform, utilitarian appearance.
Ergonomics are enhanced by a 5-position adjustable polymer stock with QD sling sockets, a Magpul MOE+ pistol grip, and a ribbed polymer fore-end. A front M-LOK adapter at the magazine-tube clamp adds a ready mounting point for compatible accessories, and the receiver carries a scope mount with rail provision.