The Mossberg 590A1 Pro 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, Magpul furniture, and a tungsten finish. The Pro designation marks it as the professional-series variant of the 590A1 line. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590A1 Pro 
• Caliber: 12 Gauge 
• Action: Pump Action 
• Capacity: 6+1 rounds 
• Barrel Length: 18.5 in 
• Color/Finish: Tungsten 
   

Detailed Features 

• 18.5-inch barrel with 3-inch chamber 
• 6+1 round capacity 
• Magpul furniture 
• Tungsten Cerakote finish 
• Professional series designation

The 590A1 Pro draws owners who want a pump-action shotgun built to a duty standard rather than a sporting one. The heavy-walled barrel and metal trigger guard are frequently cited as the distinguishing details over standard 500-series shotguns, and owners in defensive or duty applications tend to view the added weight as acceptable for the construction quality.

Magpul furniture is generally well-received. The grip texture and adjustability are common positives, though a subset of owners prefers traditional wood stocks and considers the polymer furniture less aesthetically interesting. The tungsten finish gets consistent praise for durability and resistance to wear.

The main criticism across 590A1 Pro owners is the weight. Compared to lighter pump-action designs, it is a noticeable difference in extended carry. Most owners in the home-defense and professional markets accept the trade-off, but it comes up in nearly every long-term review.