$49.99
2 in stock
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When you own a quality pistol like the FN 509 Midsize, the last thing you want is a magazine that makes you second-guess the platform. This is FN's own factory-made 10-round magazine, engineered specifically for the 509 Midsize frame. The fitment is exact, the feeding is consistent, and it's built to the same standards as the magazine that shipped with your gun.
The body is constructed from steel with a polished stainless finish under a flat black coat, giving it durability that holds up to regular use and the occasional rough handling that comes with range life. Inside, a steel wire spring drives a high-visibility orange anti-tilt polymer follower, which helps prevent the kind of feed-angle issues that cause malfunctions. The rigid polymer base pad sits flush and flat at the bottom of your grip, keeping the profile clean.
One thing worth knowing: the 509 Midsize uses a magazine that's specific to that model. While it shares the same pistol internals as the full-size 509, the Midsize magazine has a shorter body, shorter spring, and a different baseplate to match the reduced grip frame. The standard full-size 509 magazine will not function correctly in the Midsize without modification, so this factory-correct version is the right call. It drops free, seats positively, and works the way FN intended.
This is a practical pick for anyone wanting a dedicated 10-round spare for their 509 Midsize, whether that's for training purposes, keeping extras loaded and ready, or simply having a backup when one magazine is being cleaned or inspected. Sold individually.
No, this magazine is designed specifically for the FN 509 Midsize. The Midsize uses a shorter magazine body, a different spring length, and a redesigned baseplate compared to the standard full-size 509 or Tactical models. Using the wrong magazine in the wrong platform can cause feeding or fitment problems, so it's best to stick with the model-specific option.
Yes, this is a factory original magazine made by FN America, built to the same specifications and with the same materials as the magazine that ships with the pistol. It is not an aftermarket substitute. You get the same steel body, steel wire spring, and polymer follower that FN uses in their production magazines.
Higher-capacity FN 509 magazines can physically fit in the 509 Midsize, but FN recommends using grip sleeves to prevent over-insertion and ensure proper function. The 10-round Midsize-specific magazine like this one is a straightforward, no-fuss option that seats and functions correctly without any additional accessories needed.
The combination of a steel wire spring and an anti-tilt polymer follower keeps rounds properly aligned as the magazine feeds under the bolt face. The anti-tilt design specifically helps prevent the follower from canting inside the body, which is one of the more common causes of feeding stoppages in pistol magazines.
This listing is for one (1) magazine. If you want to stock up, it is worth picking up a few at once so you have dedicated spares for range sessions or training without running the same magazine repeatedly.
No, this magazine is made for the FN 509 Midsize specifically. The Compact and Compact MRD models use their own magazine sizing. Always verify the model fit before purchasing to ensure proper function and safe operation.
| UPC | 845737010386 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100349 |
| Brand Fit | FN |
| Caliber/Gauge | 9mm |
| Capacity | 10 |
| Length | 5.8500 |
| Model | |
| Model Fit | 509 Midsize |
| Package Height | 1.5 |
| Package Width | 3.0 |
| Product Type | Detachable |
| Shipping Weight | 0.21 |
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