FN MAG Sleeve — FN 509M 9mm 24rd Sleeve for 24-Round Magazine | BLACK20-100356 • 20100356 | UPC 845737010171
Upgrade the look, feel, and durability of your FN 509M 9mm 24-round magazines with the FN MAG Sleeve (BLACK20-100356 / 20100356). This low-profile, precision-fitted sleeve is engineered to protect factory magazines, improve handling, and deliver a clean, tactical aesthetic—perfect for duty rigs, range kits, and everyday carry setups. Built to fit the FN 509M 24-round magazine footprint, the sleeve provides enhanced grip, impact protection, and a snag-free profile while preserving full magazine function and reliability.
Engineered Fit for FN 509M 24-Round Magazines
Designed specifically for the FN 509M 9mm 24RD magazine, this sleeve slides on quickly and conforms to the exact external dimensions for a secure, rattle-free fit. The sleeve preserves the magazine’s drop-in compatibility with factory magwells and most aftermarket holsters and mag carriers while adding a thin protective layer that reduces wear on finishes and feed lips during transport and storage.
Key Features & Benefits
Product: FN MAG Sleeve for FN 509M 9mm 24-Round Magazine
Model / Part #: BLACK20-100356 • 20100356
UPC: 845737010171
Color / Finish: Matte Black — low reflectivity, tactical look
Compatibility: Specifically sized for FN 509M 9mm 24RD factory magazines (also fits many other standard-profile 24-round 9mm magazines)
Construction: Durable, impact-resistant polymer sleeve with textured exterior for positive grip (slip-resistant surface)
Low-Profile Design: Adds protection without increasing overall magazine width or compromising holster fit
Tool-Free Installation: Simple slip-on design — easy to install and remove for cleaning or inspection
Protects Finish & Prevents Rattle: Minimizes metal-to-metal contact during transport and storage, reducing cosmetic wear and eliminating noisy magazines in gear bags
Ergonomic Grip: Subtle texture and finger-index features improve magazine handling, reload speed, and positive retention during tactical reloads
Maintains Functionality: Does not interfere with feed lips, follower movement, or magazine catch engagement
Why Add an FN MAG Sleeve to Your Gear?
A magazine sleeve is a small, affordable upgrade that delivers multiple real-world advantages:
Extend magazine life by protecting blued or finished steel from dings and scratches.
Improve reloads with a grippier surface—helpful in wet, cold, or gloved conditions.
Reduce noise during carry—no more clanking metal in your bag or pack.
Keep a consistent look across your magazines for a professional, tactical appearance.
For competitive shooters, law-enforcement professionals, and everyday carriers alike, the FN MAG Sleeve is a practical accessory that improves both function and form.
Installation & Care
Install: With the magazine unloaded and cleared, simply slide the sleeve over the magazine body from the bottom or top depending on sleeve orientation. Ensure the sleeve seats fully and that the magazine catch and feed lips are unobstructed.
Removal: Pull the sleeve off by hand for cleaning, inspection, or to use the magazine without a sleeve.
Care: Wipe clean with a damp cloth; avoid prolonged exposure to harsh solvents. Check sleeve seating periodically and remove for full magazine maintenance as recommended by the firearm manufacturer.
Technical Specifications (At-a-Glance)
Model / SKU: BLACK20-100356 • 20100356
UPC: 845737010171
Intended For: FN 509M 9mm 24RD magazines (primary) / compatible standard-profile 24-round 9mm mags (secondary)
Material: Impact-resistant polymer (textured finish)
Finish: Matte black, low-glare
Installation: Slip-on, tool-free
Function: Protective sleeve — does not alter magazine capacity or internal components
Compatibility & Fit Notes
This sleeve is precision-sized for FN 509M 24-round magazines—before ordering, verify your magazine model and profile. While the sleeve is engineered for FN 509M factory mags, it may fit other 24-round, standard-profile 9mm magazines with similar external dimensions. If you use extended base pads, aftermarket followers, or non-standard mag bodies, check fitment before permanent use.
Final Thought — Small Upgrade, Big Impact
The FN MAG Sleeve (BLACK20-100356 / 20100356) is a practical, performance-minded accessory that protects your investment, improves handling, and gives your magazines a clean, tactical finish. Lightweight and unobtrusive, it preserves magazine function while adding the durability and grip today’s shooters demand.
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