The Mossberg 590S is a pump-action shotgun chambered in 12 Gauge with an 18.5-inch heavy-walled barrel. It holds 10 rounds, has a drilled and tapped black receiver, and comes with a fixed black synthetic stock and a matte blued finish. 
 

Key Specifications 

• Brand: Mossberg 
• Model: 590S 
• Caliber: 12 Gauge 
• Action: Pump Action 
• Capacity: 10 rounds 
• Barrel Length: 18.5 inches 
• Color/Finish: Matte Blue/Black 
   

Detailed Features 

• Pump-action with a 3-inch chamber for 12 Gauge shells 
• 18.5-inch heavy-walled barrel with matte blued finish 
• 10-round capacity 
• Drilled and tapped receiver 
• Fixed black synthetic stock 
• Threaded barrel

Owners of the Mossberg 590S with the 18.5-inch barrel value it for its high-capacity configuration and the heavy-walled barrel's durability under sustained use. The 10-round capacity is a consistent point of discussion among owners looking for utility in a pump-action platform.

The drilled and tapped receiver is well-received by those who want to mount optics or accessories without modifications. The synthetic stock is considered straightforward and no-frills, which most owners in this category prefer for practical reasons.

The 590S trigger gets mixed reactions: it cycles reliably, but the pull weight is often described as heavier than preferred for precision work. Those using it in field or home-defense roles tend to find it acceptable, while those who prioritize a light trigger point out the difference compared to lighter-pulling alternatives.