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ETS has built a strong reputation for no-nonsense aftermarket magazines, and the GLK-18-40 is a solid example of why. This 40-round extended magazine is built for the most popular 9mm Glock frames out there, fitting the G17, G18, G19, G26, G34, and G45 across Gen 1 through Gen 5. Whether you run a compact carry gun or a full-size competition pistol, this mag drops right in.
The clear polymer body is one of the most useful features here. Being able to glance down and see exactly how many rounds you have left without breaking your grip or your focus is a genuine advantage at the range and in any high-volume shooting scenario. The polymer itself is engineered to resist impact, chemicals, UV exposure, and temperature extremes, so it won't go brittle on you sitting in a cold car or a hot range bag.
One thing that sets ETS magazines apart is the creep-resistant feed lip design. Most high-capacity polymer mags will eventually splay at the lips if you leave them stored fully loaded for extended periods, which can cause feeding issues. ETS addresses this with a body and feed lip geometry that holds its shape long term, even under constant spring pressure. Inside, a heat-treated steel spring and an anti-tilt follower work together to keep rounds feeding reliably from the first shot to the last.
The baseplate is removable for easy cleaning and is interchangeable with other ETS 9mm double-stack magazines. It's also designed to play nice with Glock factory extensions and a wide range of aftermarket floorplates. The ergonomic shape makes it easy to pull cleanly from a mag pouch, which matters when you're running it in competition or structured training.
This magazine is a go-to for competition shooters, PCC runners, and anyone who wants to spend more time shooting and less time reloading. It ships as a single magazine and carries a lifetime warranty from ETS.
This magazine is compatible with the Glock G17, G18, G19, G19X, G26, G34, and G45 chambered in 9mm. It works across Gen 1 through Gen 5 Glock pistols. It's also widely used in 9mm pistol caliber carbines that accept Glock-pattern magazines, like the Kel-Tec Sub-2000 and Kriss Vector.
Yes, and this is one of the standout features of ETS magazines. The polymer body and feed lips are engineered with a creep-resistant design, meaning they won't splay or deform under constant spring pressure over time. You can leave it fully loaded in storage without worrying about feeding problems down the road.
The baseplate on the GLK-18-40 is designed to be compatible with Glock factory floorplate extensions as well as many popular aftermarket options. It's also interchangeable with other ETS 9mm double-stack magazine baseplates, giving you some flexibility in how you run it.
ETS notes that due to the oversized, controlled-tilt follower design, this magazine is intended to be inserted into the firearm when loaded, not empty. Attempting to seat an empty magazine may not allow it to lock in place properly, so keep that in mind during handling and drills.
For high-volume range sessions or competition stages, being able to see your remaining round count at a glance without dropping the mag is a real time-saver. You can also verify the ammo type loaded at a glance, which is handy if you're running multiple calibers or load types. It's a small thing that adds up over a long day of shooting.
ETS backs this magazine with a lifetime warranty. It's also made in the USA, which reflects their commitment to quality control. For a high-capacity aftermarket mag at this price point, that kind of coverage is worth noting.
| UPC | 854094005829 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GLK-18-40 |
| Brand Fit | Glock |
| Caliber/Gauge | 9mm |
| Capacity | 40 |
| Color | Clear |
| Model | |
| Model Fit | G17,18,19,26,34,45 |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.33 |
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