Mossberg 590A1 Pro | 12 Gauge | 18.5 in | Mfg# 50794

The Mossberg 590A1 Pro is a professional-grade pump-action 12‑gauge shotgun built for corrosive or wet environments. It ships with an 18.50-inch heavy-walled barrel, Marinecote protective finish and Magpul SGA furniture for adjustable ergonomics. The receiver is optic-ready and the sighting package includes a metal ghost-ring rear and a front fiber-optic sight for rapid, consistent sight alignment.

Typical applications include law-enforcement patrol and maritime/field operations where corrosion resistance and durable controls are required. It also serves well for range training and tactical team use.

Product Specifications

• The UPC is 015813507943.
• The ATF model is listed as M590A1.
• The gauge is 12 Gauge.
• The action type is Pump Action.
• The barrel measures 18.50 inches and is described as heavy-walled.
• The chamber size is 3 inches.
• The capacity is 6+1.
• The exterior finish is Marinecote.
• The stock/grip is Black Magpul SGA with included spacers for adjustment.
• The sighting system is metal ghost-ring rear with a front fiber-optic sight.
• The choke system is an Accu-Choke and it ships with a cylinder bore choke.
• The length of pull is listed as 12.25 to 14.25 inches (adjustable via included spacers).
• The overall length is listed as 38.5 inches.
• Includes Magpul SGA furniture and Professional Series features such as dual extractors and steel-to-steel lockup.
• The receiver is optic-ready and allows direct mounting of micro red-dot footprints (plate removable / RMSc footprint).

This configuration emphasizes corrosion resistance and serviceable controls for demanding conditions. The combination of a protective Marinecote finish, a heavy-walled barrel and Magpul SGA furniture provides a stable, adjustable platform suitable for repetitive operational use and professional training environments.

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