Remington 870 Special Purpose Marine Magnum 12 Gauge, 18.5 in, Matte Nickel, 3 in Chamber, Cylinder Bore, Magpul Furniture
This Remington 870 Special Purpose Marine Magnum stands out with its corrosion-resistant electroless-nickel finish and practical defensive setup. It features an 18.5-inch cylinder-bore barrel with a plain bead front sight, a 3-inch chamber, and a factory extended magazine tube. Upgraded Magpul SGA stock and MOE forend are installed, with the length of pull set to 12.5 inches. The Marine Magnum series was discontinued circa 2020, adding interest for buyers seeking this configuration.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Not applicable - Smoothbore (cylinder bore).
Specific Condition Notes: There are minor markings consistent with prior handling and use. A receiver-mounted shell carrier backing plate is installed, but the shell carrier itself is not included. The bore is bright and clean. Please refer to the photos for a closer look.
What’s Included
- Remington 870 Special Purpose Marine Magnum 12 Gauge pump-action shotgun
- Magpul SGA 870 stock (installed), length of pull set to 12.5 in
- Magpul MOE 870 forend (installed)
- Receiver-mounted shell carrier backing plate (installed)
The Marine Magnum treatment covers the receiver, barrel, and magazine components in a matte electroless-nickel finish for corrosion resistance. This factory configuration is designed to perform in harsh, wet environments while maintaining a clean, uniform appearance.
The 18.5-inch barrel is a plain, non-rib cylinder bore with a bead front sight. It is marked CYL and paired with a chamber marked "12GA 2 3/4 OR 3," giving you 3-inch chamber capability. Ejection is from the right side.
An extended tubular magazine runs approximately flush with the muzzle, with a stated capacity of 5+1. The compact barrel length and cylinder choke make for a straightforward defensive setup.
Magpul furniture is installed: an SGA 870 stock with adjustable length of pull and rubber buttpad, and a Magpul MOE 870 forend. The stock is set to a 12.5-inch length of pull for a shorter, maneuverable fit. A receiver-mounted shell carrier backing plate is also installed.
This U.S.-made Special Purpose Marine Magnum variant was discontinued around 2020, making complete examples with the factory nickel finish and practical upgrades increasingly sought after.