FN 510
The FN 510 Tactical is FN America’s 10mm Auto pistol and one of the highest-capacity 10mm pistols ever produced—22+1 rounds in a double-stack magazine that gives 10mm buyers capacity that rivals 9mm competitors. Built to the same military manufacturing standards as the FN 509 and FN 545, the 510 ships with a 4.71” cold hammer-forged threaded barrel, FN’s Low-Profile Optics Mounting System for direct red dot mounting, fully ambidextrous slide and magazine releases, and interchangeable backstraps. For buyers who want the stopping power of 10mm Auto with no capacity compromise, the FN 510 is the definitive platform.
Read our full FN 510 Buying Guide ↓
22+1 Capacity in 10mm Auto
Most 10mm pistols hold 10–15 rounds in a full-size frame—the Glock 20 holds 15, the Dan Wesson Bruin 8. The FN 510’s 22-round extended magazine is exceptional for the caliber, achieved through FN’s grip geometry engineering that accommodates the 10mm case diameter without making the grip unmanageable. A 15-round flush magazine also ships with the pistol for a more compact profile. For 10mm buyers who always felt capacity-constrained relative to 9mm-armed shooters, the FN 510’s 22+1 configuration eliminates that trade-off entirely.
The Case for 10mm Auto
The 10mm Auto delivers substantially more muzzle energy than 9mm or .45 ACP—full-power loads from Buffalo Bore, Underwood, and Federal push a 180-grain bullet to 1,300+ fps and generate over 675 ft-lbs of muzzle energy, roughly double a standard 9mm load. This performance makes 10mm the preferred handgun cartridge for backcountry defense against large predators, hunting, and buyers who specifically want maximum pistol stopping power. The FN 510’s combination of 10mm power and 22+1 capacity is genuinely unique in the production pistol market.
FN 510 vs. FN 509 vs. FN 545: The FN Tactical Family
FN’s tactical pistol family covers three calibers on the same fundamental platform: the 509 in 9mm (17+1), the 510 in 10mm Auto (22+1), and the 545 in .45 ACP (18+1). All three share the same frame dimensions, ambidextrous controls, optics mounting system, and threaded barrel. The choice is a caliber decision. The 509 for maximum aftermarket support and economics. The 510 for maximum power and capacity in a hard-hitting cartridge. The 545 for .45 ACP with no capacity compromise. All are built to FN’s military contract manufacturing standards.
Threaded Barrel and Suppressed Use
The FN 510 ships with a 4.71” cold hammer-forged barrel threaded at .578x28, accepting standard 10mm suppressors directly. Suppressed 10mm is growing in popularity among hunters and backcountry users who want to reduce report for hearing protection without sacrificing the cartridge’s terminal performance. The threaded barrel also accepts compensators for recoil management with full-power 10mm loads. FN’s cold hammer-forging process produces a barrel with better rifling consistency and longer service life than button-rifled alternatives.
Related Pages
Compare the 9mm version on the FN 509 page, see the .45 ACP option on the FN 545 page, or browse the complete FN America lineup.