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The Five-seveN is a pistol that was purpose-built around one of the most capable cartridges NATO ever standardized, and the magazine is a big part of why it runs so well. This is the factory-original 20-round magazine from FN America, made to the same manufacturing specs and tolerances as the magazine that shipped with your pistol. That means proper fit, proper feed angle, and no guesswork.
The body is made from durable, lightweight polymer with a black finish. Inside, a low-friction anti-tilt polymer follower keeps rounds aligned and feeding smoothly, backed by a high-tensile steel wire spring that maintains consistent tension over thousands of load-and-unload cycles. Numbered witness holes run along the rear of the magazine so you can do a fast round count without dropping the mag. The baseplate is removable for easy cleaning and inspection, which matters a lot if you carry these mags regularly or put them through heavy range use.
One thing worth knowing before you buy: this magazine is designed for the Five-seveN USG and MK2 models. It is not compatible with the newer MK3 MRD. FN redesigned the magazine retention system for the MK3, and the two are not interchangeable. If you own the MK3 MRD, make sure you pick up the correct variant.
Loading these magazines is a little different from most pistol mags. Because of the 5.7x28mm cartridge's bottleneck shape, rounds load straight down between the feed lips, more like an AR-15 magazine than a traditional pistol mag. It's intuitive once you've done it a couple times, and most people find it easy to load all the way to 20 without a lot of thumb fatigue.
Whether you're stocking up on range mags, replacing a worn-out original, or just want a spare in the bag, this is the magazine FN built the gun around. You're not going to do better than factory.
No, this magazine (MPN 3866100030) is designed for the Five-seveN USG and MK2 models. FN updated the magazine retention system when they introduced the MK3 MRD in 2022, and the two designs are not interchangeable. If you have a MK3 MRD, you'll need to pick up the magazine specific to that model.
This is a genuine OEM factory magazine made by FN America to the same specifications and tolerances as the magazines that ship with the pistol. It is not an aftermarket or third-party product. That means proper fit and the feeding reliability FN engineered the Five-seveN around.
Numbered witness holes are small openings along the rear spine of the magazine body, with numbers printed or molded next to them indicating round count. You can glance at the mag and immediately see approximately how many rounds remain without removing it from the gun or doing a chamber check.
It's actually a bit easier for most people. Because of the 5.7x28mm cartridge's shape, rounds load straight down between the feed lips, similar to loading an AR-15 magazine rather than the push-and-slide motion of most pistol mags. Most people find the loading process comfortable all the way to the full 20-round capacity.
Yes, the impact-resistant polymer baseplate is removable, which makes field stripping the magazine for cleaning and inspection straightforward. Regular maintenance of your magazines goes a long way toward long-term reliability, especially if you carry them or expose them to dust and debris regularly.
For range use, having at least two or three spares makes for a much smoother session since you spend more time shooting and less time loading. For defensive or duty use, most people consider three to four loaded magazines a solid baseline. These are factory mags, so rotating them through regular use is perfectly fine.
| UPC | 818513003018 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 3866100030 |
| Brand Fit | FN |
| Caliber/Gauge | 5.7 x 28 mm |
| Capacity | 20 |
| Color | Black |
| Length | 6.4500 |
| Model | |
| Model Fit | Five-seveN |
| Package Height | 1.4 |
| Package Width | 2.8 |
| Product Type | Detachable |
| Quantity | 1 |
| Shipping Weight | 0.2 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Style | Detachable |
| Units per Box | 1 |
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