Remington 870 Marine Magnum
Remington Arms Company (RemArms) · Shotgun · In Production · 1992
Also known as: 870 Marine Magnum, 870 SPS Marine Magnum, Marine 870, R25012
Overview
The Remington 870 Marine Magnum is a corrosion-resistant variant of the iconic Remington 870 pump-action shotgun, purpose-built for harsh saltwater and high-humidity environments. Every metal surface, including the inside of the barrel and receiver, is plated with electroless nickel to resist the relentless attack of salt spray, moisture, and brine that destroys conventionally finished firearms. The Marine Magnum features a 18.5-inch cylinder-choked barrel chambered for both 2-3/4-inch and 3-inch 12-gauge shells, a 6-round extended magazine tube, a synthetic stock with aggressive checkering for positive control with wet hands, and a padded Cordura sling for comfortable carry. It is the shotgun of choice for boat owners, coastal law enforcement, anti-piracy detachments, and anyone who needs the proven 870 platform to survive in environments where standard blued or parkerized finishes would be eaten alive.
Specifications
| Weight (empty) | 3402 g (120.0 oz) |
| Overall Length | 978 mm (38.50") |
| Barrel Length | 470 mm (18.50") |
| Action Type | Pump Action |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 6 rounds |
| Magazine Type | Tube |
| Effective Range | 40 m (44 yd) |
| Barrel Rifling | None |
| Frame Material | Steel |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Electroless Nickel |
Calibers
- 12 Gauge 3 Inch Magnum · primary — also known as 12 ga 3", 12 ga Magnum, 12 bore 76mm
Features
- Firing modes: Repeating
- Feed systems: Tubular Magazine
- Safety mechanisms: Cross Bolt Safety, Trigger Disconnect
- Features: Dual Action Bars, Electroless Nickel Plated Throughout, Synthetic Stock With Checkering, Cylinder Choke, Single Bead Front Sight, Padded Cordura Sling, Sling Swivel Studs, Extended Magazine Tube, Receiver Machined From Solid Steel, Corrosion Resistant
Variants
- Remington 870 Tac-14 Marine Magnum — Firearm Short Barrel
- Remington 870 Police Marine Magnum — Law Enforcement
Base model
Service history
Operators
- United States Coast Guard
- United States Navy
- Maritime Law Enforcement Agencies
- United States Civilian Market · adopted 1992
Production
Production years: 1992-present
Specific Marine Magnum production numbers are not published; the broader 870 family has exceeded 13 million units since 1950
Origin
Country of origin: United States
Designer: L. Ray Crittendon (base 870 design)
Notes
The Marine Magnum was introduced by Remington in the early 1990s as a dedicated marine variant, replacing earlier nickel-plated models. The electroless nickel process deposits a uniform coating on every surface including bore interiors, providing far better corrosion resistance than chrome plating or stainless steel for harsh marine use. Remington also offers a Police Marine Magnum (R25047) with rifle sights, +2 magazine extension, and 7-round capacity for law enforcement applications, and a Tac-14 Marine Magnum firearm (non-NFA) with a 14-inch barrel and Raptor pistol grip. Production was relocated from Ilion, New York to LaGrange, Georgia in 2024 by RemArms following Remington's 2020 bankruptcy.
Background
The Marine Magnum's electroless nickel finish is so thorough that it coats the inside of the barrel and the inside of the receiver, parts most owners will never see; the process dunks the entire shotgun in a chemical bath that bonds nickel to every molecule of exposed steel without electricity, producing a finish hard enough to survive years of salt-spray service that would rust a conventional 870 to scrap.