FN Five-seveN MRD 5.7x28mm 4.8in Optic-Ready Black
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Specs at a glance
About this product
The FN Five-seveN MRD 5.7x28mm 4.8in Optic-Ready Black is a factory-upgraded version of the proven Five-seveN platform, built to take a red dot right out of the box. It chambers the lightweight 5.7x28mm cartridge, giving you a flat-shooting, low-recoil experience in a handgun that holds 20+1 rounds. This is the same cold hammer-forged barrel and chrome-lined bore FN is known for, now with a slide cut that accepts multiple optic footprints via a plate system.
Specifications
| Manufacturer | FN America |
|---|---|
| Model | Five-seveN MRD |
| Material | Cold hammer-forged steel barrel, chrome-lined bore; polymer frame with steel inserts |
| Compatibility | Accepts most micro red-dot optics via included adapter plates (RMR, Docter, DeltaPoint Pro, etc.) |
| Finish | Black |
| Weight | 21.6 oz (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- Optic-Ready Slide — The MRD slide comes factory-milled with a multi-plate system, so you can mount your preferred micro red dot without sending the slide to a machine shop. Why it matters: Faster target acquisition and better accuracy for shooters of all skill levels.
- Cold Hammer-Forged, Chrome-Lined Barrel — FN cold hammers the barrel from a solid billet, then chrome-lines the bore and chamber. Why it matters: This barrel will outlast most shooters, with exceptional corrosion resistance and long-term accuracy.
- Enhanced Stippling on Polymer Frame — The frame texture is more aggressive than earlier Five-seveN models, with a high undercut trigger guard and a reshaped beavertail. Why it matters: You get a secure, repeatable grip even with sweaty hands or when shooting rapidly.
- Adjustable Iron Sights That Co-Witness — The rear sight is fully adjustable for windage and elevation, and with a standard-height red dot, you get a lower 1/3 co-witness. Why it matters: If your dot fails, your irons are right there without needing to swap plates or change your grip.
- 20-Round Steel Magazines (Two Included) — Each magazine holds 20 rounds of 5.7x28mm, and the steel body feeds reliably even with the lightweight FN SS197SR load. Why it matters: You get more capacity than most full-size 9mm pistols, with less weight per round.
Who It’s For
This pistol is for the shooter who wants a lightweight, high-capacity defensive handgun that shoots flat and soft, but also wants the option to run a red dot without sending the slide out. It’s a natural fit for home defense, range use, and even competition in the growing 5.7mm division.
Pros & Cons
- Pros: Low recoil (felt like a .22 Magnum with more punch), 20+1 capacity, factory optic cut with multiple plates, accurate barrel, reliable feeding with quality 5.7x28mm ammo.
- Cons: Ammo cost and availability can be spotty compared to 9mm, and the trigger pull is about 6-7 lbs with some creep — not a match trigger out of the box. Also, the grip angle is different from a 1911, so it takes some getting used to if you’re a 1911 shooter.
Comparison
| Feature | FN Five-seveN MRD | Ruger-57 | Smith & Wesson M&P 5.7 |
|---|---|---|---|
| Optic Ready | Yes (multi-plate system) | No (factory model, optic-ready version available separately) | Yes (CORE system) |
| Barrel Length | 4.8 in | 4.94 in | 5.0 in |
| Capacity | 20+1 | 20+1 | 22+1 |
| Weight (unloaded) | 21.6 oz | 24.5 oz | 24.2 oz |
| MSRP | $1,199 | $799 | $779 |
| Proven Track Record | Military/LE use since 2000 | Civilian market since 2020 | Civilian market since 2023 |
Frequently Asked Questions
Does the FN Five-seveN MRD come with mounting plates for different red dots?
Yes. The pistol ships with three adapter plates that cover the most common micro red-dot footprints: Trijicon RMR (and Holosun 407C/507C), Docter/Noblex, and DeltaPoint Pro. You can also buy an additional plate for the Shield RMSc footprint directly from FN.
Can I use standard Five-seveN magazines in the MRD model?
Yes. The MRD uses the same 20-round steel magazines as the standard Five-seveN. Two magazines come with the pistol, and spare magazines are readily available. They are also compatible with the FN PS90 carbine with an adapter.
Is 5.7x28mm ammo hard to find and expensive?
It’s more expensive than 9mm (typically $0.60-$1.00 per round for FMJ), but availability has improved significantly since 2020. Brands like FN, Federal, Speer, and American Eagle all produce it. For self-defense, the FN SS197SR or Speer Gold Dot 5.7mm are solid choices.
Will my existing holster fit the MRD model?
Probably not if your holster is molded for the standard Five-seveN, because the MRD slide is slightly taller due to the optic cut. Many holster makers now offer MRD-specific options. We recommend a light-bearing holster that indexes on the trigger guard, or a custom kydex holster for the MRD.
Ready to Order
This FN Five-seveN MRD 5.7x28mm 4.8in Optic-Ready Black is in stock and ready to ship. Per FN America specs, the cold hammer-forged barrel and chrome-lined bore are built to handle thousands of rounds. One honest drawback: the trigger is serviceable but not match-grade — but that’s easy to upgrade later if you want. According to a 2025 industry report, 5.7x28mm handgun sales have grown by over 40% since 2022, making this one of the fastest-growing calibers in the US market.
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Also check out our semi auto handguns, pistol optics, and 5.7x28mm ammunition.
Last updated: April 2026