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The FN 509 Compact is a serious carry gun, and it deserves magazines that can keep up with it. This is not an aftermarket substitute — it's a genuine FN America factory magazine, part number 20-100379, built to the exact specifications and tolerances as the original. That matters more than people sometimes realize. A magazine that isn't dialed in to the gun's feed geometry can cause feeding issues that have nothing to do with the pistol itself. With this one, you get the same fit and function as stock.
The body is heat-treated stainless steel with a flat black finish, which gives it solid resistance to corrosion and good crush resistance if it takes a hit during a drop or reload. Inside, a steel wire spring and high-visibility anti-tilt polymer follower work together to keep rounds feeding smoothly and predictably. Numbered witness holes run along the spine so you can do a quick round count without dropping the mag.
The 15-round capacity makes this the higher-capacity option for the 509C. It ships with an extended floorplate and polymer grip sleeve, which adds a bit of height to the grip and gives your hand a fuller, more secure purchase compared to running the flush 12-rounder. A lot of 509C owners run the 12-round for carry and keep one of these 15s as a spare reload, and that setup makes a lot of sense. The sleeve integrates cleanly with the frame and doesn't feel tacked on.
Important to note: this magazine is designed specifically for the FN 509 Compact and will not fit the FNS or FNX pistol lines. It is not interchangeable with those platforms.
This magazine is designed specifically for the FN 509 Compact (509C) and is not compatible with the FNS or FNX pistol lines. The 509C does have the ability to accept larger-capacity FN 509 family magazines like the 17- and 24-rounders from the full-size and Tactical models, but those are separate products. Always verify compatibility before purchasing a magazine for a different 509 variant.
The 12-round magazine sits flush with the grip frame and is the more concealable option, making it a popular choice for everyday carry. The 15-round mag — this one — is slightly longer and comes with an extended floorplate and grip sleeve that adds height to the grip. Many 509C owners carry the 12-rounder in the gun and run the 15-rounder as a spare, which is a solid setup that balances concealability with on-tap capacity.
This is a genuine factory OEM magazine from FN America, part number 20-100379. It's manufactured to the same specs, tolerances, and materials as the magazine that came with your pistol. Factory OEM magazines are always the safest bet for reliable feeding and proper function.
Yes, and it's one of the things 509C shooters tend to appreciate right away. The 509C's compact frame means there isn't a lot of grip real estate for larger hands. The sleeve that comes with the 15-round mag extends the grip height and gives your bottom fingers a more secure purchase, which helps with control and follow-up shots. If you have medium to large hands, it can make the gun feel noticeably better in hand.
A good baseline for most people is at least two to three spares on top of what came with the pistol. Magazines are considered consumable components that wear over time, so having extras on hand means you always have something reliable ready to go. It also lets you rotate magazines during range sessions without running the same one repeatedly.
| UPC | 845737010393 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20-100379 |
| Brand Fit | FN |
| Caliber/Gauge | 9mm |
| Capacity | 15 |
| Color | Black |
| Length | 6 |
| Model | |
| Model Fit | 509 Compact |
| Package Height | 1.4 |
| Package Width | 2.7 |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.225 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| 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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