The Mossberg 590A1 Retrograde is a 12-gauge pump-action shotgun with a 20-inch heavy-walled barrel, 3-inch chamber, and 8+1 capacity. It weighs 7 lbs and measures 41 inches overall. The stained walnut stock and forend give it a traditional look on an otherwise tactical platform. Ghost ring rear and bead front sights are standard. The barrel has an integrated heat shield. Finish is black Parkerized. Safety is a top tang design. 
 

Key Specifications 

• Model: 590A1 Retrograde 
• Gauge: 12 Gauge 
• Chamber: 3" 
• Action: Pump Action 
• Capacity: 8+1 rounds 
• Barrel Length: 20" 
• Overall Length: 41" 
• Weight: 7 lbs 
• Sights: Ghost Ring 
• Stock Material: Walnut 
• Finish Type: Black Parkerized 
• Safety Feature: Top Tang Safety 
   
  The heavy-walled barrel on the 590A1 is built to handle sustained fire better than standard 500 barrels. The heat shield keeps fingers off a hot barrel during rapid cycling. Ghost ring sights give faster target acquisition in low light than bead-only setups. The top tang safety location keeps it accessible without shifting grip position.

The 590A1 Retrograde's combination of walnut furniture on a mil-spec pump action generates strong opinions, mostly positive. Owners like the classic aesthetic alongside the 590A1's known durability. The action cycles smoothly and handles a range of loads without issue.

Build quality consistently comes up as a strength, with the Parkerized finish and heavy barrel construction seen as durable enough for hard use. Versatility with accessories is noted; the 590A1 platform accommodates lights, optics, and sling attachments easily. A few users comment on weight: 7 lbs is on the heavier end for a 20-inch pump, which can matter for those who plan to hold it ready for extended periods. Pricing is generally viewed as fair for what the gun delivers. Some discussions touch on the 590A1's history and military use, particularly among collectors.