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The FN 503 was built around two magazine configurations, and the 6-rounder is the one that keeps the gun at its most concealable. With the flush-profile baseplate tucked just under the grip, the pistol stays compact and snag-free in a holster. That pinky extension on the baseplate adds just enough grip surface to feel secure without adding bulk you can feel under a shirt.
This is a direct factory replacement from FN America, meaning it's made to the same tight tolerances as the magazine that shipped with your pistol. The stainless steel body is heat-treated and corrosion-resistant, with a polished satin finish that holds up well over time. Inside, a high-tensile steel wire spring and anti-tilt polymer follower work together to keep rounds feeding reliably and consistently. The precision-machined feed lips ensure proper cartridge alignment every time you seat the mag.
Factory-machined witness holes on the side let you do a quick visual check of how many rounds you have left without dropping the mag, which is a small detail that matters in a carry setup. The polymer baseplate is removable for cleaning and maintenance, and the whole assembly is straightforward to disassemble.
Whether you're picking up a backup mag for the range, restocking after wear, or just keeping a loaded spare in a drawer at home, this magazine is purpose-built for the FN 503 and nothing else. It fits, feeds, and functions exactly the way FN intended.
This is a genuine factory magazine made by FN America to the same specifications and tolerances as the magazine that originally ships with the FN 503. It is not an aftermarket or third-party product. If you want the exact fit and feed reliability FN designed the pistol around, this is it.
The 6-round magazine uses a compact pinky extension baseplate that keeps the pistol at its most concealable profile, sitting close to flush with the bottom of the grip frame. The 8-round extended magazine adds roughly an inch to the grip height via a sleeve that wraps the frame, giving a fuller hand position but increasing the overall size of the gun. The 6-rounder is the go-to choice when concealment is the priority.
No, the FN 503 uses a unique single-stack magazine that is specific to that platform and is not cross-compatible with other FN pistols such as the FN 509 series or the FN Reflex. Always use magazines specifically designed for your pistol to ensure reliable feeding and a proper fit.
Yes, the FN 503 pistol originally shipped from FN America with one 6-round and one 8-round magazine included in the box. This listing is for the 6-round magazine sold individually as a spare or replacement.
The FN 503 6-round magazine features side-facing witness holes machined into the stainless steel body. These allow you to quickly see the remaining round count at a glance without removing the magazine from the pistol, which is a handy feature for both range and carry use.
FN America discontinued the FN 503 in 2023, but factory original magazines like this one are still available through authorized dealers. If you own a 503, picking up spare mags now while stock is around is a smart move, since availability of OEM accessories for discontinued firearms tends to get spottier over time.
| UPC | 845737009106 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100262 |
| Brand Fit | FN |
| Caliber/Gauge | 9mm |
| Capacity | 6 |
| Length | 6.5 |
| Model | |
| Model Fit | 503 |
| Package Height | 1.4 |
| Package Width | 2.7 |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.15 |
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