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The FN 509C is already a capable compact pistol, but the 12-round flush mag it ships with leaves some people wanting more. This factory 17-round magazine from FN America is the natural step up. It's built on the same proven platform as the full-size FN 509 mags, with a heat-treated stainless steel body and a durable matte black finish that holds up to regular use and won't corrode sitting in a range bag or a safe.
Inside, you get a steel wire spring paired with an anti-tilt polymer follower. That combination keeps rounds feeding smoothly and consistently from the first round to the last, whether you're running drills at the range or trusting the gun for carry. Numbered witness holes run along the side so you can get a quick visual round count without stripping the mag. The removable floorplate lets you break it down for cleaning when needed.
The key thing that makes this mag work specifically with the 509C is the included polymer grip sleeve. Without it, a standard full-size FN 509 17-rounder will technically function in the compact, but it sticks out noticeably below the grip. This mag comes with the matching sleeve already accounted for, so it integrates cleanly with the frame for a snag-free profile. It's a detail that matters for carry, and FN got it right.
This is a genuine FN America part, not a third-party reproduction. If you carry the 509C or run it on the range, having a spare factory mag on hand is just good practice. It's one less variable to worry about.
Yes, but only because it comes with the polymer grip sleeve that bridges the gap between the longer magazine body and the compact frame. Without that sleeve, a standard full-size FN 509 17-rounder will still function in the 509C, but it protrudes below the grip. The sleeve that comes with this mag takes care of that so everything sits clean and snag-free.
The steel magazine body is the same 17-round unit used across the FN 509 platform. What makes this specific product (MPN 20-100510) a 509C magazine is that it is configured and packaged with the grip sleeve designed to fit the compact frame. The FN 509C is compatible with all higher-capacity FN 509 magazines, so the underlying mag body carries over across the family.
This is a genuine factory OEM magazine made by FN America, the same manufacturer as the pistol itself. It is not a third-party or aftermarket reproduction. Using factory mags is generally the most reliable option since they are engineered to the exact tolerances of the firearm.
The magazine features numbered witness holes along the side of the steel body. You can quickly glance at the visible round count without removing the mag from the pistol. It's a small but useful feature when running drills or doing a quick chamber check at the range.
The 17-round magazine body is shared across the FN 509 platform and will function in other FN 509 variants. However, the polymer grip sleeve included with this specific magazine is designed for the 509C frame, so it would not apply to full-size 509 models. If you run multiple 509 variants, these mags are a versatile option to have on hand.
Yes, the polymer floorplate is removable, which allows you to fully disassemble the magazine for cleaning and inspection. Keeping your mags clean is good practice, especially if you carry the same magazine regularly or put it through heavy range use.
| UPC | 845737013509 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20-100510 |
| Caliber/Gauge | 9mm |
| Capacity | 17 |
| Length | 6.6 |
| Model | |
| Package Height | 1.4 |
| Package Width | 2.8 |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.25 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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