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The 10mm Auto has earned a serious following for good reason — it's one of the most versatile handgun cartridges available, covering everything from home defense to backcountry carry. The FN 510 MRD takes that cartridge and packages it into a full-size, striker-fired pistol that's genuinely ready to run with a red dot the moment you take it out of the box. No trips to a gunsmith, no extra hardware to source. FN's Low-Profile Optics Mounting System accepts all the major optics footprints, and four MRD mounting plates come in the box to cover just about any dot you'd want to run.
The 4.1-inch barrel is cold hammer-forged and target crowned, which is the kind of construction you'd typically expect on a range or competition pistol, not just a defensive handgun. The polished feed ramp and chamber help keep things reliable with the full range of 10mm loads, from practice ammo to hot hunting rounds. The machined steel slide features front and rear cocking serrations plus a loaded chamber indicator, and the driftable steel sights are cut tall enough to co-witness with most mounted optics. The trigger breaks cleanly with a precision-tuned pull in the 5.5 to 7.7 pound range and a short reset — not a target pistol trigger, but well-suited to the caliber and use case.
FN put real thought into how this gun handles 10mm recoil. The grip frame uses multi-zone texturing in a 360-degree layout to keep things anchored under fire, and two interchangeable backstraps let you dial in trigger reach and fit. Ambidextrous slide stops and magazine release mean this works equally well for left- and right-handed shooters. There's also a four-slot MIL-STD-1913 Picatinny rail up front for weapon lights, which matters a lot if this is going to serve a home defense role. At 31 ounces unloaded with a 7.7-inch overall length, it's a full-size gun that wears its weight well. The Flat Dark Earth finish covers both the frame and slide, giving it a sharp, consistent look that holds up in real-world conditions.
The FN 510 MRD uses FN's patented Low-Profile Optics Mounting System and ships with four mounting plates that cover the most popular footprints on the market, including Trijicon RMR/SRO, Leupold DeltaPoint Pro, Holosun 507/508, Vortex Venom/Viper/Razor, Docter, C-More STS2, and Burris FastFire patterns. Most major micro red dots can be mounted without any additional hardware. The slide is cut so that no gunsmithing is required.
The main difference comes down to the barrel. The 510 MRD has a 4.1-inch flush-fit barrel without threading, while the Tactical version has a longer 4.71-inch threaded barrel designed to accept suppressors and compensators. The MRD also ships with two 15-round flush-fit magazines rather than the Tactical's flush and extended mag combo. Both models share the same frame, optics system, ambidextrous controls, and overall ergonomics.
The 10mm Auto is one of the most popular cartridges for outdoor and backcountry carry, especially where large predators are a concern, and the FN 510 MRD packages it well for that use. The 15+1 capacity, full-size grip frame, optics-ready slide, and Picatinny rail for a weapon light make it a capable and versatile outdoor sidearm. The cold hammer-forged barrel and polished feed ramp are built to handle the wide variety of 10mm loads you'd run in that environment.
No, the FN 510 MRD does not have a manual thumb safety. Like most modern striker-fired duty pistols, it relies on internal passive safeties built into the trigger and fire control system. This is a common and deliberate design choice for a gun intended for defensive use, where a manual safety could slow the draw.
FN rates the trigger pull at 5.5 to 7.7 pounds, and describes it as precision-tuned with a clean break and short reset. In real-world use and independent testing, it's been measured breaking in the 6-pound range on average. It's a solid defensive trigger — not a match trigger, but one that works well for the intended purpose of this platform.
Yes. The 510 MRD was designed from the ground up for the 10mm Auto cartridge, with a cold hammer-forged barrel, polished feed ramp and chamber, and a high-endurance conical striker to handle the demands of the caliber. Independent testers have run it with a wide variety of full-power 10mm ammunition including hollow points and heavier hunting loads without reliability issues.
| UPC | 845737015640 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101380 |
| Action | |
| ATF Type | Pistol |
| Barrel Finish | Black |
| Barrel Length | 4.1" |
| Caliber/Gauge | 10mm |
| Capacity | 15 + 1 |
| Color | Flat Dark Earth |
| Length | 11.9500 |
| Model | |
| Number of Magazines | 2 |
| Package Height | 3.3 |
| Package Width | 11.1 |
| Product Type | Striker Fired |
| Safety | No |
| Shipping Weight | 4.1 |
| Sights | Driftable Steel Co-Witness |
| Sights Type | Driftable Steel Co-Witness |
| Slide Description | Optic Cut/Serrated |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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