FN 509C Magazine 9mm 10-Round Extended Floorplate FDE

Frequently Asked Questions

Will this FN 509C magazine fit any other FN pistols besides the 509 Compact?

No. This magazine is designed specifically for the FN 509 Compact and is not compatible with the FNS or FNX series pistols. If you're unsure which model you have, check the slide markings on your firearm before ordering. The 509 Compact is a distinct platform from other FN pistol lines.

What is the extended floorplate for, and will it affect concealed carry?

The extended floorplate gives you a bit more surface area to grip the magazine during a reload, which can make a real difference under stress or while wearing gloves. For most IWB carry setups, it sits flush enough to the grip frame that it doesn't create a printing issue, but that can vary depending on your holster. If you need a completely flush profile, FN also makes a standard floorplate version of the 10-round 509C magazine.

Why does this magazine have a bright orange follower?

The high-visibility orange anti-tilt follower serves two purposes. First, it makes it immediately obvious when the magazine is empty, which is useful during training and range sessions. Second, the anti-tilt design helps ensure the last round presents at the correct angle for reliable feeding, which reduces the chance of a malfunction during the final cartridge cycle.

Is this a genuine FN factory magazine or an aftermarket product?

This is a 100% genuine OEM factory magazine produced by FN America. It is manufactured to the same specifications and tolerances as the magazines that ship with the FN 509 Compact from the factory. There are aftermarket alternatives out there, but this is the real deal straight from FN.

Does the FN 509C 10-round magazine have witness holes to check round count?

Yes. The magazine body includes numbered witness holes along the rear so you can do a quick visual round count without removing the mag from the pistol or stripping it down. It's a small but genuinely useful feature when you're managing rounds at the range.

Can I use higher-capacity FN 509 magazines in my 509 Compact?

The 509 Compact can accept larger-capacity magazines from the FN 509 lineup, such as the 15 or 17-round mags, though they will extend past the grip frame. This 10-round magazine with extended floorplate is the preferred choice when concealability is the priority, since it keeps the overall package compact and manageable.