The Mossberg 590S is a 12-gauge pump-action shotgun with an 18.5-inch barrel, 6+1 capacity, and matte blued finish. At 6.75 lbs and 38 inches overall, it is a compact, defense-oriented configuration. The defining feature of the 590S platform is its ability to cycle minishells, 1-3/4-inch shells, as well as full-length 2-3/4-inch and 3-inch loads, which gives capacity options the standard 590 does not have. 
 

Key Specifications 

• UPC: 015813516068 
• Action: Pump Action 
• Barrel Length: 18.5 inches 
• Capacity: 6 rounds (5+1) 
• Finish: Matte Blued/Gray 
• Gauge: 12 GA 
• Receiver Finish: Matte Blued 
• Weight: 6.75 lbs 
   

Detailed Features 

 
The Magpul SGA stock adjusts length of pull from 12.25 inches to 14.25 inches via spacers, which covers a broad range of shooter sizes. The steel barrel's matte blued finish reduces glare and handles normal weather. Bead sights work fine for close-range defensive use. The 38-inch overall length keeps it manageable in a hallway or vehicle.

Owners most often talk about the 590S's minishell compatibility as the primary reason they chose it over the standard 590. The ability to run Aguila minishells and get more rounds in the tube draws enthusiasts who prioritize capacity in a compact package.

The Magpul SGA stock gets consistent positive comments for fit adjustability and its no-slip texture. Pump action reliability is rarely questioned. The 590 action has a long track record.

The main discussions around tradeoffs involve recoil with full-power loads in a sub-6.75-lb gun, and some owners note the 18.5-inch barrel is less forgiving on pattern development at distance than longer hunting barrels. Neither is a complaint about defects; both are inherent to the compact defensive configuration.

Overall reception is positive for its intended role.