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The FN 503 was purpose-built as a slim, single-stack 9mm for concealed carry, and the magazines it runs matter. This factory OEM 8-round magazine is made to FN's exact specifications, which means fit and function the same as the mag that shipped with your pistol. No guessing, no aftermarket compromises.
The body is stainless steel, heat-treated and precision-machined with feed lips that keep things tight and wobble-free. Inside, a high-tensile steel wire spring and anti-tilt polymer follower work together to keep rounds feeding cleanly and consistently, round after round. The black polymer base pad gives you a solid purchase at the bottom of the mag and adds a clean, finished look.
What sets the 8-rounder apart from the 503's flush 6-round magazine is the textured grip sleeve that wraps around the extended body. It blends right into the pistol's frame texture and gives your hand noticeably more to hold onto, which pays off especially during fast follow-up shots or if you have larger hands. Reviewers consistently noted that accuracy and control improved with the 8-round extended mag versus the shorter flush-fit option. The tradeoff is a slightly longer grip profile, so some carry-focused users opt to carry with the 6-rounder in the gun and keep this one as a spare for reloads.
Since the FN 503 was discontinued in 2023, factory magazines like this one are the right call for keeping your pistol running exactly as FN intended. This magazine is sold individually and fits all FN 503 pistols in 9mm.
No, this magazine was designed specifically for the FN 503 and is not cross-compatible with other FN models like the FN 509 or FN Reflex. The 503 uses its own single-stack form factor and dimensions. Always verify compatibility before purchasing a magazine for any firearm.
The 6-round magazine sits flush with the grip frame and gives the 503 its most compact, concealable profile. The 8-round magazine extends below the grip and includes a textured sleeve that mimics the pistol's grip texture, giving you more hand contact and better control. Most users find the 8-round magazine noticeably more comfortable to shoot, though it does add a little length to the grip.
This is a genuine factory OEM magazine made by FN America, carrying part number 20-100261. It is built to the same specifications as the magazines that ship with the FN 503 pistol, so fit, function, and feeding reliability are exactly what FN intended.
FN discontinued the 503 pistol in 2023, but factory magazines like this one continue to be available through distributors and retailers while supplies last. If you own a 503, it is a good idea to stock up on factory mags now rather than wait until availability thins out further.
Yes, the stainless steel magazine body features witness holes so you can visually check your round count without removing the magazine from the gun. It is a small but useful feature for a carry pistol.
| UPC | 845737009090 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100261 |
| Brand Fit | FN |
| Caliber/Gauge | 9mm |
| Capacity | 8 |
| Color | Black |
| Model | |
| Model Fit | 503 |
| Product Type | Magazine |
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