The Mossberg 590RM in 12 gauge with an 18.5-inch barrel is a box-magazine-fed shotgun (brand part no. 50213) equipped with MBUS 3 folding backup sights for a low-profile, optic-ready sight picture. Mossberg ships this 590RM with a 10-round detachable magazine and a fixed cylinder bore choke, and the folding sights stow flat when an optic is mounted on the receiver. The shotgun’s 46.1-inch overall length gives a full-size shoulder mount on a 12 gauge platform. Among pump-action shotguns, the 590RM favors shooters who want box-magazine reloads with the flexibility of folding, optic-compatible sights.

Key Specifications

• Chambered in 12 gauge.
• Operates as a pump-action shotgun.
• Features an 18.5-inch barrel.
• Feeds from a detachable box magazine with a 10+1-round capacity.
• Includes a 10-round magazine in the box.
• Equipped with MBUS 3 folding backup sights.
• Fitted with a cylinder bore choke.
• Overall length is 46.1 inches.
• Ships at approximately 10.8 pounds.

Frequently Asked Questions

Do the sights fold down? Yes, the MBUS 3 backup sights fold flat for use with a mounted optic.

Does this shotgun use a box magazine? Yes, it feeds from a detachable 10-round box magazine.

Buy the Mossberg 590RM Shotgun

Box-magazine reloads with folding, optic-compatible sights are exactly what the 590RM delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.