Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and accessories. The Remington 870 Marine Magnum 12 Gauge Police Trade-In Shotguns are robust, used, 12-gauge pump-action shotguns built for harsh environments. Their electroless nickel plating provides superior corrosion resistance. Available now for $450.0.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
| Product Type | Pump-Action Shotgun |
|---|---|
| Material | Steel receiver, barrel, and internal components; synthetic furniture |
| Manufacturing | Remington Arms, USA |
| Finish | Electroless Nickel Plating (MarineCoat) on metal surfaces |
| Hardness/Quality | Designed for extreme durability and corrosion resistance in harsh conditions. Police-grade construction. |
| Compatibility | 12 Gauge shotshells (2.75″ and 3″ magnum) |
| Installation/Usage | Ready to use out of the box after FFL transfer. Standard shotgun operation. |
| Weight | Approximately 7.5 lbs (unloaded) |
| Dimensions | Overall Length: ~38.5″ (18″ barrel model) |
| Country of Origin | USA |
| Condition | Police Trade-in (used, may show cosmetic wear consistent with duty use) |
| SKU | REM870MM-PTI |
What makes these police trade-in 870s worth considering?
These Remington 870 Marine Magnum 12 gauge police trade-in shotguns are built like tanks. The Marine Magnum designation isn’t just for show; it means these shotguns have an electroless nickel plating on all metal parts. This finish is a significant upgrade over standard bluing or parkerizing, offering superior resistance to rust and corrosion, especially in humid or saltwater environments. For police use, that meant reliability whether it was stored in a patrol car or exposed to the elements. For you, it means a shotgun that’s going to hold up to whatever you throw at it, whether it’s sitting in a duck blind in Kansas or riding in a truck off-road. These aren’t safe queens; they’re working guns, and they’ve got the character to prove it.
Who should consider buying a used Marine Magnum?
These shotguns are for folks who value rugged reliability over pristine aesthetics. If you’re looking for a dependable home defense shotgun, a truck gun, or something to take out in rough weather for hunting, these 870 Marine Magnums fit the bill. The 870 platform is one of the most proven pump-action designs out there, and the Marine Magnum variant takes that durability up a notch. Given their police trade-in status, they’ve been used, but they’ve also been maintained to a professional standard. They’re broken in, not broken down.
What are the pros and cons of these trade-in shotguns?
- ✅ Extreme Corrosion Resistance: The electroless nickel (MarineCoat) finish protects against rust, crucial for harsh conditions.
- ✅ Legendary Reliability: The Remington 870 platform is a proven workhorse, trusted by law enforcement and military worldwide.
- ✅ Duty-Grade Durability: Built to withstand the rigors of police use, meaning they’re tough and will last.
- ✅ Affordable Price Point: Getting a Marine Magnum at a trade-in price makes a robust shotgun accessible.
- ✅ Versatile: Suitable for home defense, hunting (especially waterfowl), and general utility.
- ✅ Simple to Operate: Classic pump-action design is intuitive and requires minimal training.
- ❌ Cosmetic Wear: As police trade-ins, expect dings, scratches, and finish wear consistent with duty use. These aren’t collector’s items.
- ❌ No Frills: These are utilitarian tools; don’t expect fancy features or custom furniture.
- ❌ Used Condition: While functional, they are not new. Some internal parts may show wear, though typically within operational limits. (If you need pristine, see our new shotguns for factory-fresh options.)
How do these compare to other shotguns on the market?
| Feature | Remington 870 Marine Magnum (Police Trade-in) | Maverick 88 Security (New) | Mossberg 590A1 (New) |
|---|---|---|---|
| Material | Steel with Electroless Nickel finish, Synthetic | Steel with Blued finish, Synthetic | Heavy-walled Steel with Parkerized finish, Synthetic/Aluminum |
| Quality | Duty-grade, used, high corrosion resistance | Entry-level, new, good value | Military-spec, new, extreme durability |
| Compatibility | Standard 12 Gauge accessories | Mossberg 500/590 accessories (some) | Mossberg 590 accessories |
| Shipping | FFL transfer required, ships from Wichita, KS | FFL transfer required, ships from retailer | FFL transfer required, ships from retailer |
| Lifespan/Durability | Proven decades of use, excellent corrosion resistance | Good for casual use, less robust finish | Built for combat, very high durability |
| Price | ~$450 (Trade-in) | ~$250-300 | ~$800+ |
When you put these Remington 870 Marine Magnums up against something like a new Maverick 88, the difference in build quality and finish is apparent. The Maverick is a fine budget gun, but it doesn’t have the same level of corrosion protection or the heavy-duty components of the 870 Marine Magnum. Compared to a Mossberg 590A1, the 590A1 certainly has its own military pedigree and heavy barrel, but the Marine Magnum’s unique finish gives it an edge in specific, corrosive environments. For the money, getting a duty-grade, corrosion-resistant 870 is a solid deal.
Frequently Asked Questions
Where can I buy shotguns online?
You can buy shotguns online right here at Kansas Gunshop (kansas-gunshop.com). We facilitate the FFL transfer process to your local dealer.
What does 'police trade-in' mean for a shotgun?
'Police trade-in' means these shotguns were previously issued to law enforcement agencies and have been traded in for newer equipment. They are used and will show cosmetic wear, but are generally well-maintained and fully functional for duty use.
Is the Remington 870 Marine Magnum suitable for home defense?
Yes, the Remington 870 Marine Magnum is an excellent choice for home defense. Its reliability, simple operation, and robust construction make it a dependable option for personal and home protection.
What kind of maintenance does the Marine Magnum finish require?
The electroless nickel finish on the Marine Magnum is very low maintenance. It resists corrosion much better than blued or parkerized finishes, requiring only standard cleaning and lubrication of internal moving parts. The exterior can be wiped down with a lightly oiled cloth.
Can I use 3-inch magnum shells in these 12 gauge shotguns?
Yes, these Remington 870 Marine Magnum shotguns are chambered for both 2.75-inch and 3-inch 12 gauge shotshells, allowing for a wide range of ammunition choices.
What is the typical capacity of these police trade-in 870s?
Most police configuration Remington 870 Marine Magnums typically have a capacity of 6+1 rounds (6 in the tube, 1 in the chamber) with 2.75-inch shells, often featuring an extended magazine tube.
How does the FFL transfer process work when buying online?
When you purchase a firearm from Kansas Gunshop, we will ship it to a licensed Federal Firearm License (FFL) dealer near you. You will need to contact your chosen FFL dealer, arrange the transfer, and complete the necessary background checks and paperwork with them to take possession of your firearm.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Ready to add a workhorse to your collection?
These Remington 870 Marine Magnum 12 Gauge Police Trade-In Shotguns are a solid choice for anyone needing a reliable, tough, and corrosion-resistant shotgun without breaking the bank. They’ve served their time, and they’re ready for their next chapter with you. Don’t miss out on these dependable firearms.
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