Mossberg 590 Mariner 12 Gauge Pump-Action Shotgun, 20.5-Inch, 8+1, Marinecote Finish
The Mossberg 590 Mariner pairs the proven 590 action with a corrosion-resistant Marinecote finish, creating a shotgun built for harsh, wet environments. Its 20.5-inch cylinder-bore barrel, 8+1 capacity, and tang-mounted safety mirror the configuration used by U.S. Coast Guard and marine law-enforcement units. This example remains in very good condition with only light handling marks, giving buyers a reliable, purpose-built shotgun that still looks sharp.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use. Minor superficial scratches and small blemishes are present but do not affect function or appearance beyond light wear.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear. The bore is bright and shiny from chamber to muzzle.
What’s Included
- Mossberg 590 Mariner 12 Gauge pump-action shotgun
The Marinecote electroless-nickel finish covers the barrel, receiver, and magazine tube, offering superior resistance to saltwater and humidity. This treatment makes the 590 Mariner a practical option for boat duty, coastal defense, or any environment where rust is a threat.
Its 20.5-inch steel barrel features a fixed cylinder bore and a brass bead front sight, giving users a wide pattern and quick target acquisition—ideal for close-quarters defense and maritime boarding operations.
The extended magazine tube holds eight 2 ¾-inch shells, plus one in the chamber, for a total capacity of nine rounds. A clean-out cap at the muzzle simplifies maintenance and ensures reliable feeding even after exposure to sand or salt.
The black synthetic stock and ribbed corn-cob forend provide a firm grip in wet conditions. A 13.875-inch length of pull suits most shooters while keeping the shotgun maneuverable in tight spaces.
The receiver is drilled and tapped, allowing easy installation of optics or ghost-ring sights for those who prefer an upgraded sighting solution.