The Mossberg 590R is a pump-action shotgun chambered in 12 Gauge with an 18.5-inch barrel and a 6+1 round capacity. It has a 3-inch chamber and ships with Magpul MBUS flip-up sights. The adjustable stock accepts an interchangeable recoil pad and fits a compact Magpul forend with MOE pistol grip. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590R 
• Caliber: 12 Gauge 
• Action: Pump Action 
• Capacity: 6+1 
• Barrel Length: 18.5 in 
• Color/Finish: Matte Blue / Black 
   

Detailed Features 

• 18.5-inch barrel with cylinder-choke tube 
• 3-inch chamber for standard and magnum shells 
• Magpul MBUS 3 flip-up front and rear sights 
• 5-position adjustable stock with interchangeable recoil pad 
• Flat-profile trigger with matte blue finish on receiver

Owners of the Mossberg 590R point to the pump-action reliability as its main draw. The gun cycles through a wide range of shell loads without complaint, and the 18.5-inch barrel keeps it manageable indoors. The MBUS sights are a welcome addition over a bare bead, though some shooters swap them for a red dot once they run the gun a bit.

The adjustable stock and compact forend get mixed reactions. Smaller-framed shooters appreciate the length-of-pull options, but a few note that the MOE pistol grip adds bulk compared to a standard stock. The 6+1 capacity is considered adequate for a security role, though tube extensions are commonly added.

Value is generally seen as solid for a Mossberg pump with factory sights included. The main complaint is finish durability on the receiver over time; owners who work the gun hard tend to see wear on the matte coating faster than on comparable models.