Remington 870 Marine Magnum 12 Gauge Police Trade-In Shotgun

  • Item Number: 870 MM 18IN 2RD EXT SYN TRADE
  • /
  • View More Items by Remington
  • /
  • Condition: USED
Remington 870 Marine Magnum 12 Gauge Police Trade-In Shotgun
$779.99 $849.99

Limited-time Deal
In Stock with FREE shipping
30-Day Free Returns

If this used firearm is found to be mechanically defective, it can be returned in its original, shipped condition for a full refund or replacement within 30 days of purchase. Learn more

  • REMINGTON 870 POLICE MAGNUM 12GA NFA POLICE TRADE-IN

    Remington 870 Police Magnum 12 Gauge NFA Police Trade-In SBS with Ohio State Highway Patrol Stamp
    $549.99

  • REMINGTON REMINGTON 870 MARINE MAGNUM  12GA PISTOL GRIP PUMP

    Remington 870 Marine Magnum 12GA Police Trade-In Shotgun with Pistol Grip
    $779.99

  • Winchester 12 Gauge 2 3/4 in 1oz Ranger Rifled Slug Low Recoil Trade Ammo 5/Box

    Winchester 12 Gauge 2 3/4 in 1oz Ranger Rifled Slug Low Recoil Trade Ammo 5/Box
    $7.49 $3.99
    ($0.80 / round)

  • Winchester 12 Gauge 2-3/4-In 1oz Slug Super X Police Trade Ammo 5/Box

    Winchester 12 Gauge 2-3/4-In 1oz Slug Super X Police Trade Ammo 5/Box
    $3.99
    ($0.80 / round)

  • Federal 12 Gauge 2-3/4 in 9-Pellet 00 Buckshot Police Trade-In Ammo 5/Box

    Federal 12 Gauge 2-3/4 in 9-Pellet 00 Buckshot Police Trade-In Ammo 5/Box
    $4.99
    ($1.00 / round)

  • Winchester 12 Gauge 2.75 in 9 Pellet 00 Buck Ranger Police Trade Ammunition 5/Box

    Winchester 12 Gauge 2.75 in 9 Pellet 00 Buck Ranger Police Trade Ammunition 5/Box
    $3.99
    ($0.80 / round)

  • Fiocchi 12 Gauge 2-3/4 in 9 Pellet Defense Dynamics 25/Box

    Fiocchi 12 Gauge 2-3/4 in 9 Pellet Defense Dynamics 25/Box
    $10.99
    ($0.44 / round)

  • Winchester 12-Gauge 3 Inch 1 1/8 oz 2 Shot America 250th Anniversary Ed. 10/Box

    Winchester 12-Gauge 3 Inch 1 1/8 oz 2 Shot America 250th Anniversary Ed. 10/Box
    $32.99
    ($3.30 / round)

  • Federal 12 Gauge 2-3/4 in 9 Pellet Police Trade Ammo 5/Box

    Federal 12 Gauge 2-3/4 in 9 Pellet Police Trade Ammo 5/Box
    $4.99
    ($1.00 / round)

  • Rio 12 Gauge 2.75in 9 Pellets 1 Buckshot Royal Buck 25/Box

    Rio 12 Gauge 2.75in 9 Pellets 1 Buckshot Royal Buck 25/Box
    $10.99
    ($0.44 / round)

  • Winchester 12 Gauge 2.75 Inch 8 Shot Super X 25 Rounds per Box

    Winchester 12 Gauge 2.75 Inch 8 Shot Super X 25 Rounds per Box
    $13.99
    ($0.56 / round)

  • Winchester 12-Gauge 2.75 In 1 1/8oz 8 Shot America 250th Anniversary Ed. 10/Box

    Winchester 12-Gauge 2.75 In 1 1/8oz 8 Shot America 250th Anniversary Ed. 10/Box
    $33.99
    ($3.40 / round)

  • Hornady 12 Gauge 2 3/4 Inch 300 gr FTX Shotgun Slugs 5/Box

    Hornady 12 Gauge 2 3/4 Inch 300 gr FTX Shotgun Slugs 5/Box
    $12.99
    ($2.60 / round)

  • Federal 12 Gauge 2 3/4 00 Buck Shot Power Shok Police Trade Ammo 5/Box

    Federal 12 Gauge 2 3/4 00 Buck Shot Power Shok Police Trade Ammo 5/Box
    $3.99
    ($0.80 / round)

Product Description

These photos represent the general condition of the firearms for sale, a Remington 870 Marine Magnum 12GA Police Trade-In Shotgun. The price is for 1 firearm.

As with many used trade-in firearms, these firearms may contain scratches and/or signs of wear. This is not always the case, but should not be unexpected.

Firearm Features

  • Model: 870 Marine Magnum
  • Caliber: 12 GA
  • Capacity: 4 Rounds
  • Magazine: Extended Tube Fed
  • Barrel Length: 18.5"

Used-police-trade-firearms

Customer Comments & Questions

Customer Reviews

(5 out of 5) Nice Marine Magnum
by Steven from Woodbine, MD on July 2, 2026

I picked up this Remington 870 Marine Magnum as a police trade-in from SOSS, and I couldn’t be happier. The electroless nickel finish still looks great after what was clearly years of service, super resistant to corrosion just like it’s designed for. The action is smooth, the pump is positive, and it feels like a tank in the hands. Barrel measures right where it should for a defensive setup, compact and maneuverable without going NFA, and the 3" Magnum chamber gives plenty of versatility with shells. It’s a 1999 model, confirmed via barrel code, and has that pre-Freedom Group quality that many of us appreciate. Even with some typical trade-in grime, it cleaned up beautifully with standard solvents and CLP. Whether for home defense, truck gun, or just as a reliable all-around shotgun, this thing delivers. Zero malfunctions through initial function checks, points naturally, and the nickel plating is a huge plus in humid or coastal areas. Great value on a legendary platform. The price on these is higher than in the past, but that’s what happens when the government keeps printing money. Would buy again without hesitation.