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The FAB Defense FX4210B is a floor-plate replacement for the Glock 42 that adds 4 rounds to each magazine, bringing your total capacity from 6 to 10 rounds. If the factory Glock 42 capacity feels limiting, this extension gives you a meaningful boost without requiring new magazines or tools.
The extension is built from fiberglass-reinforced polymer and uses an innovative spring plate that lets you keep your original magazine spring instead of replacing it. That design simplicity means fewer parts to worry about and consistent performance. The contoured finger indents are engineered for a firm grip when you're manipulating the magazine, and the whole profile feels natural in your hand when the magazine is inserted into the pistol.
One of the bigger advantages here is that you don't have to reload as often during training or defensive drills. Extra rounds on tap make a real difference in practice sessions, and the extended base pad also helps shooters with bigger hands get a proper full grip on a gun that's otherwise pretty small. The extension maintains the Glock 42's pocket-friendly profile, so it doesn't turn your compact carry gun into something bulky.
FAB Defense has a solid track record making magazine accessories that hold up to regular use. This extension is lightweight, straightforward to install, and designed to feed reliably when installed properly. As with any magazine accessory, test your preferred ammunition at the range before relying on it for carry to make sure the combination works in your specific pistol.
Yes. This floor-plate replacement is designed to work with standard Glock 42 factory magazines. The extension replaces the existing floor plate and uses the original magazine spring, so you don't need new magazines or springs to use it.
Yes, the extension adds approximately 3/4 inch to the magazine, which results in a longer grip when the magazine is inserted. This extra length gives shooters with bigger hands a fuller grip on the Glock 42 and improves overall control. The added length is modest enough that the pistol still maintains its pocket-carry profile.
FAB Defense extensions are built to perform reliably, but as with any magazine accessory, you should test your preferred ammunition at the range before relying on it for carry or self-defense. Compatibility between the extension, your specific magazine, and your ammunition is important to verify on your own pistol.
This extension is designed specifically for the Glock 42 in .380 ACP. It is not compatible with the Glock 43 (9mm), G43X, G48, or other Glock models. Magazine compatibility for the G42 is strict due to the smaller .380 ACP cartridge dimensions.
Installation is straightforward. The extension replaces the floor plate on your existing Glock 42 magazine. No special tools or gunsmithing is required. Most shooters can install it in minutes by simply removing the old floor plate and installing the new one.
The contoured finger indents are molded into the extension to give you a secure grip when you're handling the magazine. This makes magazine changes faster and smoother, especially under stress or during rapid training drills. The indents also help prevent your fingers from slipping during magazine manipulation.
| UPC | 7290111585005 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FX4210B |
| Brand Fit | Glock |
| Caliber/Gauge | .380 ACP |
| Capacity | 4 |
| Model | |
| Model Fit | G42 |
| Shipping Weight | 0.125 |
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