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10mm Auto is having a real moment, and for good reason. It's a round that bridges the gap between raw power and practical shootability in a way that few calibers can. FN recognized that gap and built the 510 MRD around it. This is a full-size, polymer-frame, striker-fired pistol chambered in 10mm Auto, holding 15+1 rounds flush in the grip and built to handle full-power loads without beating you up. At 31 ounces unloaded, the 510 MRD has enough mass to work with you against the 10mm's recoil impulse, and the three distinct grip texture zones across the frame keep things locked in even under hard use, wet hands, or gloves.
The 4.1-inch barrel is cold hammer-forged from stainless steel with a recessed target crown and a polished feed ramp. That's not just spec-sheet language — a polished ramp means better reliability across a wide range of commercial 10mm loads, and a target crown protects the muzzle and keeps accuracy consistent long-term. The 1:16 right-hand twist rate is optimized for bullets in the 155 to 220 grain range, which covers just about everything you'd ever run in 10mm from defensive JHPs to hard-cast hunting rounds. The trigger is FN's precision-tuned striker-fired pack with a clean break right around 6 pounds and a short reset that encourages faster, more controlled follow-up shots.
FN's Low-Profile Optics Mounting System is one of the better-engineered optics solutions in the polymer pistol market. The slide comes pre-cut and ships with four MRD mounting plates covering major footprints including Trijicon RMR/SRO, Leupold DeltaPoint Pro, Holosun 507/508, Vortex Venom/Viper/Razor, C-More STS2, Burris, and Docter — so you can mount almost any popular red dot without hunting for aftermarket hardware. The driftable steel co-witness sights sit at optic height, staying visible and functional alongside most mounted optics. Controls are fully ambidextrous — slide stop and magazine release work from either side — and the polymer frame includes a MIL-STD-1913 Picatinny rail for lights or lasers. Interchangeable backstraps let you dial in the grip-to-trigger reach for your hand size, which genuinely matters when you're managing 10mm recoil.
The 510 MRD ships with four mounting plates that cover most of the major red dot footprints on the market, including Trijicon RMR/SRO, Leupold DeltaPoint Pro, Holosun 507/508, Vortex Venom/Viper/Razor, C-More STS2, Burris, and Docter. In most cases you won't need to buy anything extra to get your optic mounted. Just confirm which footprint your specific dot uses and match it to the correct included plate.
The 510 MRD's 31-ounce unloaded weight works in your favor here. The additional mass slows the slide cycle slightly and dampens the felt recoil impulse compared to lighter 10mm platforms. The three-zone grip texture and interchangeable backstraps also help you maintain a solid, consistent hold under rapid fire. Most people who shoot it find the recoil very manageable for what is a genuinely powerful cartridge.
It's a solid choice for trail use and backcountry carry where you might encounter dangerous game. The 10mm Auto cartridge has a well-established reputation for deep penetration with quality loads, and the 15+1 capacity gives you meaningful round count. The grip texture is aggressive enough to stay put in wet or dirty conditions, and the optics-ready slide means you can add a red dot for faster target acquisition at distance.
The 510 MRD barrel has a 1:16 right-hand twist rate. This is well-suited for the most common 10mm bullet weights, stabilizing projectiles from roughly 155 to 220 grains, which covers the full range of standard defensive, range, and hunting loads you're likely to run through it.
No, the FN 510 MRD does not include a manual thumb safety. It relies on FN's internal striker-fired safety system, similar to most modern duty-style polymer pistols. This is intentional for a pistol designed around fast deployment and ambidextrous operation.
The main differences come down to the barrel and magazine configuration. The Tactical model has a longer 4.71-inch threaded barrel and ships with an extended 22-round magazine, while the MRD uses a flush-fit 4.1-inch non-threaded barrel and comes with two 15-round magazines. Both share the same Low-Profile Optics Mounting System and core ergonomics. The MRD is the more carry-practical and range-friendly configuration of the two.
| UPC | 845737015626 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66-101379 |
| Action | |
| ATF Type | Pistol |
| Barrel Finish | Black |
| Barrel Length | 4.1" |
| Caliber/Gauge | 10mm |
| Capacity | 15 + 1 |
| Color | Black |
| Length | 12 |
| Model | |
| Number of Magazines | 2 15 rd. |
| Package Height | 3.3 |
| Package Width | 11.2 |
| Product Type | Semi-Auto Pistol |
| Safety | No |
| Shipping Weight | 4.15 |
| Sights | Co-Witness Height Sights |
| Sights Type | Fixed Sights |
| 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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