ETS 27rd Extended Glock Mag Overview

The ETS 27rd Extended Glock Mag 9 mm gives you 10 extra rounds over a standard G17 magazine in a package that’s competition legal at 170mm. The clear polymer body lets you see exactly how many rounds you have left and what type of ammo is loaded. No more guessing or counting shots.

Elite Tactical Systems builds these magazines from an advanced polymer that handles abuse better than most. Drop it from 8 feet onto concrete and it won’t crack. Leave it loaded for months and the feed lips won’t spread. Run it in extreme heat, cold, or around harsh chemicals and it keeps working. ETS backs every magazine with a lifetime warranty and makes them in the USA.

Specifications

Caliber: 9mm Luger

Capacity: 27 rounds

Length: 170mm (competition legal)

Material: Clear UV-resistant polymer

Follower: Anti-tilt

Compatibility: Glock 17, 18, 19, 19X, 26, 34, 45 (Gen 1-5)

Floorplate: Compatible with Glock and aftermarket basepads

Warranty: Lifetime

Made in: USA

Why Shooters Choose ETS Extended Magazines

See Your Round Count
The translucent clear body isn’t just for looks. You can glance at the magazine and immediately know how many rounds are left. During a stage, during training, or just doing a press check before you holster, you always know what you’re working with.

Competition Legal 170mm
USPSA and other competition organizations have rules about magazine length. At 170mm, this ETS mag meets the requirements for most divisions while still giving you 27 rounds of 9mm. More rounds, fewer reloads, better stage times.

Works with Your Existing Gear
The ETS magazine is compatible with both factory Glock floorplates and aftermarket basepads. If you already run extensions on your other mags, they’ll work here too. The ergonomic floorplate design also makes these easy to grab from a mag pouch under pressure.

Built to Last
The advanced polymer construction resists impacts, temperature extremes, UV exposure, and harsh chemicals. Unlike some aftermarket magazines that become brittle over time, ETS mags hold up in real-world conditions. The anti-tilt follower ensures reliable feeding through the full 27-round stack.

Compatibility

This magazine fits all double-stack 9mm Glocks from Gen 1 through Gen 5. That includes the Glock 17, 18, 19, 19X, 26, 34, and 45. It will also work in 3D printed frames designed for these platforms, including the DD17.2, DD19.2, DD26.2, and their remixes.

Not compatible with single-stack Glocks like the G43, G43X, or G48. Those use a different magazine pattern entirely.

ETS 27rd Glock Magazine FAQ

Frequently Asked Questions

Is this reliable for carry or just range use?

ETS magazines are reliable enough for carry. The polymer construction is extremely durable, and the anti-tilt follower ensures consistent feeding. Many shooters run ETS mags for both competition and everyday carry. That said, test any magazine thoroughly with your carry ammo before depending on it.

How does this compare to OEM Glock magazines?

The main advantages over OEM are higher capacity (27 vs 17 rounds), the translucent body for visual round count, and lower cost. ETS mags are well-made and reliable, though some shooters still prefer OEM for duty use. For range, competition, or home defense, ETS magazines perform well.

Will this work with 3D printed Glock frames?

Yes. If your printed frame is designed for double-stack Glock magazines (DD17.2, DD19.2, DD26.2, G80, Geisler Defence, etc.), this magazine will work. It’s a popular choice for builds where you want extended capacity.

Can I use my existing Glock mag extensions?

Yes. ETS magazines are compatible with factory Glock floorplates and most aftermarket basepads. The baseplate is also designed for easy disassembly if you need to clean or service the magazine.

Is the clear polymer durable?

Very. ETS rates these for 8-foot drops onto hard surfaces without cracking. The polymer also resists UV degradation, temperature extremes, and chemical exposure. The feed lips are creep-resistant, so they won’t spread even when stored loaded long-term.

What states restrict this magazine?

Several states have magazine capacity restrictions that prohibit 27-round magazines. These include California, Colorado, Connecticut, Hawaii, Illinois (some areas), Massachusetts, Maryland, New Jersey, New York, Vermont, and Washington DC. Check your local laws before ordering.