FN 509 Midsize 10-Round Magazine — 9mm Luger — Black Stainless Steel (Model 20100349, UPC: 845737010386)

Upgrade your FN 509 Midsize with a factory-grade spare magazine engineered for reliability, durability, and range-ready performance. The FN 20100349 is the OEM 10-round replacement magazine for the FN 509 Midsize (509M) pistol — finished in low-glare black and built from polished stainless steel for long life and consistent feeding. FN® Firearms+1

Built to FN Standards — Reliability First

Every component on this mag is designed to meet FN’s quality standards: a hardened stainless-steel body resists deforming and provides a rigid, repeatable feed geometry; a precision steel spring offers consistent pressure for smooth upward feed of rounds; and an anti-tilt, high-visibility polymer follower helps prevent binding and makes load status obvious at a glance. These elements combine to give dependable, drop-in performance when you need it most. Palmetto State Armory+1

Key Features

• Model / Fit: FN 20100349 — fits FN 509 Midsize (509M) pistols. FN® Firearms

• Caliber: 9mm Luger (9x19).

• Capacity: 10 rounds (California / restricted-capacity compliant option). dackoutdoors.com

• Material: Polished stainless-steel body with flat black finish for corrosion resistance and a stealth look. Buds Gun Shop

• Follower: High-visibility anti-tilt polymer follower for reliable feeding and easy visual inspection. Midwest Gun Works

• Basepad: Flat black polymer floorplate — low profile for concealed carry or compact storage. Midwest Gun Works

• UPC / SKU: UPC 845737010386, SKU/Part 20100349 (useful for inventory and catalog listings). dackoutdoors.com

Why This Magazine Makes Sense

Whether you’re building an everyday-carry kit, stocking up spare mags for range sessions, or replacing a damaged OEM mag, the 20100349 offers the perfect balance of function, fit, and legal compliance in jurisdictions with magazine capacity limits. Because it’s an FN OEM part, it maintains factory tolerances for the 509 Midsize, ensuring repeatable zero and trouble-free operation with FN-spec magazines and sleeves. FN® Firearms+1

Performance & Durability Notes

• Smooth Feeding: The polished stainless interior and anti-tilt follower reduce friction and help rounds feed cleanly into the chamber under all normal shooting conditions. Palmetto State Armory

• Corrosion Resistance: Stainless steel construction plus a factory black finish improves resistance to sweat, solvents, and range environments. Buds Gun Shop

• Longevity: Heavy-duty spring steel maintains tension over many cycles; periodic maintenance (wipe down and light lubrication) keeps the mag running like new. GunMag Warehouse

Installation & Use

This mag is a straight drop-in for FN 509 Midsize pistols. Load to capacity according to local laws, insert until it locks, and press the mag release to eject. For storage, keep magazines unloaded or follow your preferred safe-storage practice. Regular inspection of the follower, spring, and floorplate is recommended for safety and optimal function. FN® Firearms+1

Who Should Buy It?

• FN 509 Midsize owners wanting an OEM replacement spare.

• Carry users in restricted-capacity jurisdictions who require 10-round magazines.

• Range enthusiasts who prefer factory magazines for consistent performance.

• Armories and shops stocking genuine FN parts for repairs and builds. dackoutdoors.com+1

SEO Keywords (naturally included)

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Short Summary: The FN 20100349 10-round stainless steel magazine is the OEM, drop-in magazine for FN 509 Midsize pistols. With a polished stainless body, high-visibility anti-tilt follower, durable spring, and low-profile floorplate, it’s an ideal factory replacement or compliant spare for everyday carry and range use. FN® Firearms+1

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