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The FN 509M magazine sleeve is a straightforward solution for using larger-capacity magazines with your Midsize frame pistol. Made from durable, impact-resistant polymer, this sleeve slides onto your factory 24-round magazine and instantly gives you a more substantial grip area. That matters more than you'd think, especially if you're used to the standard 15-round mag that ships with the 509M.
When you add this sleeve to your 24-rounder, your hand has more to grab onto. The extended grip surface improves control and comfort, particularly during faster follow-up shots or extended range sessions. It's not just feel-good stuff either—a more stable grip directly translates to better accuracy and faster sight reacquisition. The black polymer finish looks clean and professional, blending in with your setup without any tacky appearance.
Beyond ergonomics, the sleeve protects your magazine body from cosmetic scratches and dings that naturally happen during regular handling, storage, and transport. It also reduces snagging when drawing from a pouch or when the mag's in your bag. The slim profile means the sleeved magazine still fits standard mag pouches without drama—you're not adding bulk that makes carrying awkward.
This is an FN factory piece designed specifically for the 24-round 509M magazine. It's straightforward to install—just slide it on—and integrates perfectly with the frame of your 509M pistol. Whether you're running the standard 509M, the Tactical version with optics, or the MRD, this sleeve works seamlessly across the line.
This sleeve is specifically sized for the 509M (Midsize) frame and the 24-round magazine. While FN 509 magazines can be cross-compatible across different frame sizes when used with the right sleeve, this particular sleeve is engineered for the Midsize pistols. If you have a full-size or compact 509, you'd need the corresponding sleeve for those models.
Yes, the sleeve comes alone. You'll need a factory FN 509 24-round magazine to use with it. The magazine is sold separately, but when paired together, they work as an integrated system to give you that extended grip feel and the full magazine capacity.
Absolutely. The sleeve reduces snagging and adds protection during carry, making it more practical for both range use and everyday carry scenarios. The slim profile still fits standard magazine pouches, so you won't run into carry issues like you might with some aftermarket solutions.
The sleeve lets you use FN's factory 24-round magazine while maintaining better ergonomics and grip comfort on your Midsize frame. You get significantly more firepower—24 rounds instead of 15—without switching to a full-size pistol. For training days or backup rounds, that extra capacity is valuable, and the sleeve makes it comfortable to shoot.
| UPC | 845737010171 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 20100356 |
| Brand Fit | FN |
| Caliber/Gauge | 9mm |
| Capacity | 24 |
| Length | 6.5 |
| Model | |
| Model Fit | 509M |
| Package Height | 1.3 |
| Package Width | 2.7 |
| Product Type | Accessory-Magazines |
| Shipping Weight | 0.1 |
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