The Mossberg 590M is a pump-action 12 gauge shotgun with an 18.5-inch barrel finished in Tungsten Gray Cerakote and a steel receiver that is drilled and tapped. It feeds from a fixed magazine tube with a 10+1 capacity and a 2.75-inch chamber, and it wears a Magpul SGA stock in Safety Orange synthetic. The setup is built as a tactical-style pump gun for defensive and training use. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590M 
• Gauge: 12 Gauge 
• Action: Pump Action 
• Capacity: 10+1 
• Chamber: 2.75" 
• Barrel Length: 18.50" 
• Finish: Tungsten Gray Cerakote 
• Weight: 7 lbs 
   

Detailed Features 

• 18.5-inch barrel with a 1:36" twist and a steel receiver drilled and tapped for optics mounting 
• Magpul SGA stock in Safety Orange synthetic contrasts with the Tungsten Gray Cerakote metal finish 
• 10+1 magazine tube capacity on a 2.75-inch chamber 
• Ambidextrous safety for use from either shoulder 
• Overall weight of 7 lbs keeps the pump gun manageable for extended handling

Owners of the Mossberg 590M generally trust the platform's pump-action reliability, since it inherits the tuning of Mossberg's long-running 590 series that many already know from duty and home-defense use. The tube-fed magazine and Cerakote finish get positive marks for standing up to rough handling and weather.

In hand, the Safety Orange Magpul SGA stock is popular for its adjustable length of pull and comb, and some owners specifically buy the 590M for training or match use where the bright stock color helps with visual identification on a line. A few shooters note the shotgun runs heavier than a standard field gun, though most consider that a fair trade for the mag-fed capacity.

On value, the 590M sits above Mossberg's base 500 and 590 models, and buyers weigh that premium against the tactical furniture and finish already installed from the factory. Aftermarket parts commonality with the broader 590 lineup is frequently cited as a plus for anyone wanting to swap the stock or add accessories later.