FN 20100378 50910rd Extended Floorplate 9mm Luger FN 509 Compact Black/Flat Dark Earth Steel

The FN 509 Compact 9mm Luger extended floorplate magazine gives you extra round capacity and a fighting grip on a single-stack duty pistol. If you carry or train with an FN 509 Compact, this 10-round magazine is a sensible addition to your loadout—it holds one more round than the flush-fit base, and the extended floorplate extends the grip to give your pinky finger a home instead of dangling in air. Available in black or Flat Dark Earth (FDE) steel, it matches your pistol's finish.

FN engineered the 509 Compact for concealment and fast handling, and their factory magazines are built to match that reliability standard. A 10-round capacity keeps you compliant where higher-cap mags are restricted, while still adding firepower and grip surface. Whether you're setting up a backup magazine, building redundancy, or want the handling advantage of the extended floorplate during range sessions, this is purpose-built hardware, not an afterthought.

Pair this with other FN 509 Compact magazines in different capacities to suit your carry, duty, or training needs. FN offers 12, 15, and 24-round options in the same lineup, so you can tailor your battery to your role and the law where you shoot.

Key Features

• 10-round capacity for compliant carry and training
• Extended floorplate increases grip surface and round count versus flush-fit base magazines
• Available in black or Flat Dark Earth steel finish
• Factory OEM quality engineered for the FN 509 Compact platform
• Reliable, purpose-built design for duty and defensive use

Specifications

Frequently Asked Questions

Will this magazine fit my FN 509 Compact?

Yes—this is an OEM FN 509 Compact magazine. It is engineered and tested for the FN 509 Compact platform.

What's the difference between this 10-round magazine and other FN 509 Compact capacities?

FN offers 10, 12, 15, and 24-round magazines for the 509 Compact. The 10-round with extended floorplate gives you one extra round and improved grip compared to flush-fit options, while staying compliant in restricted jurisdictions. Higher capacities are available if your local law allows.

Can I choose the finish—black or FDE?

Yes. This magazine is available in both black and Flat Dark Earth (FDE) steel, so you can match your pistol's finish.

Is this a replacement magazine or do I get multiple?

This is a single 10-round magazine. FN also offers magazine kits that bundle multiple capacities if you want to build a complete loadout.