The Mossberg 590RM 12 gauge pump shotgun (brand part no. 50218) uses the first production double-stack magazine made for a pump action. Mossberg pairs that magazine with an 18.5-inch barrel, a phosphate finish and a 5-position adjustable composite stock with an interchangeable pad. A rotary safety selector gives it an AR-style safety. It carries 10+1 rounds, more capacity for its length than competing designs. It is a serious home-defense and tactical shotgun.

Key Specifications

• The gauge is 12 gauge, the standard for defensive and tactical shotguns.
• The action is pump action, a proven design that cycles reliably.
• The barrel is 18.5 inches, a maneuverable length.
• Capacity is 10+1, from a double-stack magazine that gives more capacity for the length.
• The safety is a rotary safety selector, an AR-style control that will feel familiar to AR shooters.
• The finish is phosphate, a durable, low-glare coating.
• The stock is a 5-position adjustable composite stock with an interchangeable pad, so length of pull can be fitted to the shooter.
• The choke is an Accu-Choke cylinder bore, a good open choke for buckshot and slugs.
• The shotgun weighs 7.9 pounds, a manageable weight for a full-capacity pump gun.
• Length of pull adjusts from 12 to 15.25 inches, which fits a wide range of shooters.

Frequently Asked Questions

What is the 590RM capacity? It holds 10+1 rounds, using a double-stack magazine Mossberg describes as the first production double-stack magazine for a pump action.

What kind of safety does it use? A rotary safety selector, an AR-style safety.

Is the stock adjustable? Yes. It is a 5-position adjustable composite stock with an interchangeable pad.

Buy the Mossberg 590RM Pump-Action Shotgun, 12 Gauge, 18.5-Inch Barrel, Rotary Safety, 10+1

The 590RM combines Mossberg’s durable pump-action design with a double-stack magazine and an AR-style safety. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more pump action shotguns while you are here.