Description
The Glock 42 is tight, light, and easy to carry—that's the appeal. But six rounds in the gun plus one in the chamber can feel lean when you're actually depending on it. This Warne extension solves that without turning your pocket pistol into something bigger. You get two extra rounds sitting on your existing factory magazine, and the gun stays the same size in your holster or waistband.
Build and Durability of the Warne Extension
Warne machines this from 6061-T6 aerospace-grade aluminum, the same stuff used in aircraft structures. It's then finished with a Type II hardcoat anodize in black, which creates a hard oxide layer that shrugs off corrosion and normal wear. The surface resists scratches better than standard finishes, and the aluminum itself stays light enough that you won't notice it added weight when you're carrying all day. Everything is American-made, and Warne puts the same precision they're known for in scope mounts into these extensions.
Practical Design for Speed and Control
The extension has finger grooves machined into the aluminum body—not just for looks. When you're stripping a mag out of the gun fast or fumbling a reload under any kind of pressure, those grooves give you something real to grip. The profile is shaped to slide into the Glock frame one-handed if you have to, which matters more than it sounds when you're managing multiple reloads. The whole thing sits flush with factory magazines, so your spare extended mags blend in with standard ones visually.
Capacity Without Compromise
You went from 6+1 to 8+1 in the same gun. For a .380 ACP platform where capacity gets traded against size, that's a meaningful jump. The extension preserves everything you bought the Glock 42 for—concealability, weight, simplicity—while giving you a bit more runway if things get complicated.
Key Specifications
- Manufacturer Part Number: 3131
- UPC: 656813107834
- Material: 6061-T6 Aluminum
- Finish: Type II Hardcoat Anodized Black
- Capacity Increase: +2 Rounds
- Caliber: .380 ACP
- Fits: Glock 42 Factory Magazines
- Weight: 0.06 lbs
- Height: 0.8 inches
- Dimensions (Package): 3.2 x 1.5 x 0.8 inches
- Country of Origin: Made in USA
- Manufacturer: Warne Manufacturing Company
What’s Included
- Warne magazine extension
- Retaining screw and washer
Frequently Asked Questions
Will this Warne extension work with all Glock 42 factory magazines?
Yes, it's designed as a firearm-specific accessory for Glock 42 factory magazines. The extension uses a torx head screw and washer for retention and sits flush with the magazine body. Installation involves removing the factory base pad and sliding the extension onto the magazine flange.
Does the extension affect how the Glock 42 carries or handles?
No. At 0.06 lbs and designed to maintain the compact profile, it adds negligible weight and doesn't change your gun's balance or concealability. The extended magazine sits slightly longer, but the pistol itself remains the same size.
Can I combine this with other magazine modifications like MagGuts?
That depends on the specific modification and your magazine setup. Some users combine extensions with internal upgrades, but compatibility varies. Test any combination at the range with your preferred ammo before relying on it.
What makes the hardcoat anodize finish different from regular anodizing?
Type II hardcoat anodize is thicker and harder than standard anodizing, offering better resistance to abrasion, corrosion, and scratches. This finish helps the extension stay looking good and function smoothly even with heavy use and carry wear.





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