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The 509 Midsize came out of FN's run at the Army's Modular Handgun System trials, and that pedigree shows. The 509 platform was hammered through more than a million rounds of testing during development, so reliability isn't a question mark here. What FN did with the Midsize is take the full 4-inch slide and barrel from the standard 509 and pair it with a grip that's about 0.4 inches shorter. You keep the sight radius and the recoil control of a duty pistol, but the part that usually prints under a shirt gets trimmed down to something you can carry all day without thinking about it.
The barrel is cold hammer-forged stainless steel with a recessed target crown and a polished chamber and feed ramp, which is the kind of construction you normally see on guns wearing higher price tags. The flat-faced trigger gives you a more consistent press and a cleaner break than the older FNS-style trigger, and the controls are fully ambidextrous, so left-handed folks get slide stops and mag releases on both sides without any conversion work. Aggressive front and rear cocking serrations and combat-style 3-dot luminescent sights round out a slide that's genuinely easy to run under stress, and a loaded chamber indicator lets you check status at a glance.
At 26.5 ounces with a 7.4-inch overall length and 1.35-inch width, this pistol sits in that sweet spot where it's light enough for the belt but has enough mass to soak up 9mm recoil. Two interchangeable backstraps with improved texturing let you dial in the grip to your hand, and the MIL-STD-1913 rail up front takes lights and lasers without any adapters. This version ships with two 10-round magazines, and the frame accepts larger FN 509 magazines with the use of a sleeve if you want more capacity at the range. There's no manual safety to fumble with, just a consistent striker-fired pull in the 5.5 to 7.7 pound range every time. It's a smart pick for anyone who wants one pistol that handles carry, nightstand duty, and regular range work without compromise.
Yes. The Midsize frame is compatible with the larger FN 509 magazines, including 17 and 24 round versions, when paired with a magazine sleeve to fill the gap below the grip. This model ships with two 10-round magazines from the factory.
No, this model (66-100464) has a standard slide with fixed 3-dot luminescent sights and no optic cut. If you want to run a red dot, FN makes the 509 Midsize MRD, which includes their Low Profile Optics Mounting System. That said, the combat-style sights on this one are solid for a dedicated iron-sight carry gun.
The Midsize keeps the same 4-inch barrel and slide as the standard 509 but trims the grip by about 0.4 inches, making it noticeably easier to conceal. You give up nothing in sight radius or muzzle control, and at 26.5 ounces it handles 9mm recoil comfortably. It's the version most people land on for everyday carry.
No, this is the no-manual-safety configuration. Safe operation comes from the internal striker safeties and a consistent trigger pull in the 5.5 to 7.7 pound range, similar to most modern striker-fired duty pistols. There's also a loaded chamber indicator so you can verify condition at a glance.
| UPC | 845737010027 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 66100464 |
| Action | |
| Barrel Length | 4" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Color | Black |
| Number of Magazines | 2 |
| Product Type | Pistol |
| Safety | No |
| Sights | 3-Dot Fixed |
| Sights Type | 3-Dot Fixed |
| Slide Description | Serrated |
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