FN Magazine FN FNS-40, FNX-40 40 S&W Stainless Steel Black

If you carry an FN FNS-40 or FNX-40, you need factory magazines you can trust. The FN Magazine FN FNS-40/FNX-40 40 S&W in stainless steel is built to the same exacting standards as your pistol—because a magazine failure at the worst moment isn't an option. This OEM mag is engineered specifically for these platforms, delivering the reliability and fit that aftermarket generics simply can't match.

The stainless steel body is built for serious use. Whether you're running drills at the range, carrying for personal defense, or stacking mags for a competition, the corrosion-resistant construction handles whatever conditions you throw at it. Paired with a tough polymer floorplate and follower, this magazine balances durability with practical handling—that larger floorplate makes one-handed removals from tight mag pouches far easier than you'd expect.

Round count witness holes on the rear let you visually confirm how many rounds remain without breaking your grip or unloading. In a defensive scenario or during extended range time, that quick situational awareness matters. Load it, trust it, and keep moving—that's what factory FN magazines deliver.

Key Features

• Factory OEM magazine purpose-built for FNS-40 and FNX-40 platforms
• Stainless steel body resists corrosion and handles hard use
• Polymer floorplate and follower engineered for reliable feeding
• Oversized floorplate for easier one-handed removal from pouches and holsters
• Round count witness holes for quick round verification

Specifications

Frequently Asked Questions

Will this magazine work with both the FNS-40 and FNX-40?

Yes. FN designed this magazine to function reliably in both the FNS-40 and FNX-40 platforms.

What's the material and why does it matter?

The body is stainless steel with a stainless finish, which resists corrosion and stands up to heavy use at the range, in your holster, or in storage. The floorplate and follower are polymer, combining durability with reliable feeding.

How do the round count witness holes work?

Holes molded into the rear of the magazine body let you see rounds loaded inside. You can perform a quick visual check of your remaining ammunition without removing the magazine or unloading it.

Is this a factory FN magazine?

Yes. This is an OEM FN magazine built to factory specifications, ensuring compatibility and reliability with your FNS-40 or FNX-40.