FN 510 Tactical 10mm 4.71in FDE 22+1
Video review
Expert review
About this product
The FN 510 Tactical is a full-size, service-oriented 10mm Auto pistol built for high magazine capacity and modular adaptability. This optics-ready platform delivers the terminal energy of 10mm in a package designed for serious duty, range, and outdoor use, featuring an included 22-round magazine for maximum engagement capability before reload. Its 4.71-inch threaded barrel and flat-faced trigger are engineered for suppressor compatibility and rapid follow-up shots.
What is the FN 510 Tactical 10mm used for?
This pistol is configured for professional applications where high-capacity firepower, optics mounting, and suppressor use are non-negotiable. The 10mm Auto chambering provides superior terminal ballistics for outdoor defense against large predators or barrier penetration, while the 22+1 standard capacity offers a significant tactical advantage over conventional duty pistols. Its MRD-ready slide and suppressor-ready barrel make it a turnkey host for electronic sights and muzzle devices right out of the box, suitable for law enforcement, specialized security roles, and backcountry protection.
How does the FN 510 Tactical compare to a Glock 20 MOS?
The FN 510 Tactical is a more modern, purpose-built platform with superior modularity and ergonomics compared to the legacy Glock 20 MOS design. The FN 510 offers a higher standard capacity of 22+1 versus the Glock 20's 15+1, a flatter-shooting 4.71-inch target-crowned barrel, and direct-mount optic cuts that do not require adapter plates for most popular red dots. It also ships with tritium night sights that co-witness, a feature not standard on the Glock. The Glock retains an advantage in aftermarket parts availability and a slightly lower MSRP, but the FN is the better pistol for shooters prioritizing a complete, high-performance system from the manufacturer.
What does it weigh and what are the dimensions?
The pistol's unloaded weight is 32 ounces, or 907 grams, with a barrel length of 4.71 inches (119.6 mm). This full-size frame measures approximately 8.15 inches in overall length and 5.6 inches in height with the flush-fit 15-round magazine inserted. The slide width is a standard 1.15 inches, ensuring holster compatibility with many duty-sized concealment and retention models. For hunters comparing long guns, our the Stevens 334 Rifle in .308 Win has a different mission profile with a 20-inch barrel but far less maneuverability than this handgun.
Who is this NOT for?
This is not a pistol for a first-time handgun owner or someone looking for an affordable plinking firearm. The 10mm Auto cartridge has substantial recoil and higher ammunition cost compared to 9mm Luger, and the $1000+ price point places it in the professional-tier market. It is also a poor choice for everyday concealed carry due to its full-size frame; the weight and bulk make it unsuitable for appendix or deep concealment without significant wardrobe compromises. If your primary need is a recreational shotgun, consider the more classic lines of our Stevens 555 Sporting O/U 12 Gauge.
What's in the box?
FN ships this model in a hard plastic case with the pistol, one 15-round magazine, one 22-round magazine, a cleaning kit, and the standard paperwork including a lock. Crucially, it also includes the necessary mounting plates for most popular micro-red dot optics, four #6-40 screws of varying lengths, and a thread protector for the .578x28 threaded barrel. This completeness eliminates the common $50-$100 accessory spending required with many "ready" platforms to make them truly functional.
Is the FN 510 Tactical worth it at $1,002.99?
Yes, at just over $1,000, this pistol is worth the investment for the shooter who demands a suppressor-capable, optics-ready 10mm with class-leading capacity. You are paying for a duty-grade firearm with features that would cost several hundred dollars in aftermarket work on a base model, including the threaded barrel, optic cuts, suppressor-height night sights, and a 22-round magazine capability. The build quality and controls are to FN's military-specification standards. The price is justified compared to buying a standard 10mm and then adding these components individually, which would likely exceed the total cost with lower integration quality.
Specs at a glance
Pros & cons
What works
- Holds 22+1 rounds — the highest factory 10mm capacity available in a production pistol.
- Complete suppressor-ready system with 4.71-inch threaded .578x28 barrel and included thread protector.
- Direct-mount optic system includes plates for RMR, Holosun K, and DPP footprints — no extra purchase required.
- Tritium suppressor-height night sights ship standard and co-witness through most red dot optics.
Trade-offs
- Proprietary magazine design — limits aftermarket magazine options compared to the Glock 20 platform.
- Unloaded weight of 32 oz — adds noticeable bulk which can hinder all-day concealed carry comfort.
- 10mm Auto ammunition averages $0.60-0.85 per round for quality defensive loads, significantly higher cost-per-shot than 9mm.
- Limited aftermarket support — holster and accessory selection is narrower than for legacy platforms like the Glock 20.
Key attributes
| upc | 845737015602 |
| manufacturer | FN America / FN Herstal |
| manufacturer part number | 66-101376 |
| action | Double Action Only |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 4.71" |
| caliber/gauge | 10mm |
| capacity | 22 + 1 |
| color | Flat Dark Earth |
| length | 12.1000 |
| model | FN 510T |
| number of magazines | 2 |
| package height | 3.3 |
| package width | 11.4 |
| product type | Striker Fired |
| safety | Ambidextrous Slide Stop |
| shipping weight | 4.25 |
| sights | Suppressor Height Night Sights |
| sights type | Dovetail |
| slide description | Optic Cut/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| thread pattern | .578″x28 |
| units per box | 1 |
Frequently asked questions
- Is it compatible with my existing holsters?
- Likely not without verification. The FN 510 Tactical shares a similar overall size and accessory rail with other full-size duty pistols like the Glock 20/21, but the slide profile and ambidextrous slide stop differ. You must check compatibility with your specific holster brand and model—most major manufacturers like Safariland or Blackhawk! have dedicated listings. For this model's 8.15-inch overall length, ensure your holster is for a full-size, not compact, frame.
- Does this work with a standard Glock 20 magazine?
- No, it does not. The FN 510 Tactical uses a proprietary magazine design that is not mechanically cross-compatible with Glock, Smith & Wesson, or other 10mm pistol magazines. The included 15-round and 22-round magazines are the only factory-supported options as of this writing. You cannot use modified Glock mags; always use manufacturer-specified magazines for reliable function.
- How long does shipping take for this item?
- For this restricted item, our standard processing time is 2-3 business days after order confirmation. All firearms must ship to a licensed Federal Firearms License (FFL) holder. Once shipped, transit time is typically 3-7 business days via UPS or FedEx, depending on your FFL's location. You must contact your chosen FFL dealer and provide their license information before we can process the shipment.
- Can I mount a Trijicon RMR directly to the slide?
- Yes, but you need the correct mounting plate. The FN 510's MRD optic cut uses a FN-specific footprint that accepts multiple optics via included adapter plates. One of these plates is specifically for the Trijicon RMR and SRO footprint. Use the four provided #6-40 screws and follow the specified torque specification of 15 inch-pounds to secure the optic and plate to the slide for a zero-retention fit.