Glock 19 Extended Mag Guide: Capacity, Compatibility & Top Picks

No one has ever regretted having extra rounds when it matters most. That’s why there are many Glock 19 extended mags available for those in freedom-loving states. And, since the Glock 19 is still the semi-automatic handgun by which all others are judged, let’s look at Glock 19 extended mags in this handy and informative guide. 

Can the Glock 19 and Glock 17 Share Magazines?

First, let’s address this popular question. 

The answer begins with knowing the standard magazine capacities of the Glock 17 and Glock 19. The Glock 17 is designed to hold 17 9mm rounds, while the Glock 19 holds 15. 

The Glock 17 is compatible with any double-stack 9mm Glock magazine that holds 17 or more rounds—including 19, 21, 24, or even 33-round magazines, as well as many aftermarket options. However, it cannot use 15-round Glock 19 magazines because those are too short for the Glock 17’s grip.

On the other hand, the Glock 19 can use all magazines compatible with the Glock 17, as well as its own 15-round double-stack magazines. While larger magazines will protrude from the grip, they will function reliably. 

​A 10-round magazine designed for the Glock 17 will fit and function in both the Glock 17 and Glock 19. However, a 10-round Glock 19 magazine won’t work in the Glock 17, as it’s too short for the longer grip and magazine well.

​For the same reasons, 10- and 15-round Glock 19 magazines can be used in the subcompact Glock 26, but not in other models. The Glock 34, 45, and 19X all share the Glock 17 frame and longer grip, making them incompatible with the shorter Glock 19 magazines.

Key Factors to Consider When Choosing a Glock 19 Extended Magazine

When upgrading your Glock 19, consider the following factors for the best performance and reliability:

1. Reliability

• Look for magazines with a proven track record in feeding and function.
• Choose brands that use quality springs and followers to ensure consistent performance.

2. Durability

• Magazines should be built from tough materials (like steel-reinforced polymer) to withstand drops and rough handling.
• Resistance to cracking and deformation is crucial.

3. Ease of Maintenance

• Disassembly for cleaning is a big plus, especially if you shoot often.

4. Ergonomics

• Some extended magazines include sleeves or baseplates for better grip and comfort.

5. Compatibility & Compliance

• Make sure the magazine fits your Glock 19, Gen 3/4/5/6 as needed.
• Check your state’s magazine capacity laws before purchasing.

Top Brands for Glock 19 Extended Magazines

Glock OEM

Glock’s own extended magazines are always a safe bet for compatibility and reliability. Options include 17-, 24-, or even 33-round magazines. Glock mags are good, but they lack imagination or innovation. No metal baseplates, not really many capacity options, and Glock doesn’t offer anything cool like clear mags or big drums. 

Magpul

Magpul PMAGs are one of the more cost effective options available.  End users report varying degrees of reliability.  Many shooters regard them as range only or training only magazines rather than carry magazines.  These magazines do not have metal lined feed lips or bodies, which increases the internal feeding friction of the magazine.  Magazines left loaded in hot vehicles may suffer feed lip fatigue and eventual failure.

Elite Tactical Systems (ETS)

Elite Tactical Systems (ETS) are mainly known for clear/translucent magazines. They offer high-capacity options (like 30+ rounds) with hardened-steel feed lips and full-body visibility, so you can count your rounds at a glance. They are less durable and less reliable, but still generally okay for a day at the range. Just don’t drop it. 

TorkMag

TorkMag provides a unique option: a G17-pattern magazine that holds 20 rounds right out of the box. Unlike other brands that require you to purchase an extended baseplate to boost a G17 magazine from 17 to 20 rounds, TorkMag’s design delivers this extra capacity from the start—making it a convenient and innovative solution.

SGM Tactical

The SGM Tactical 9mm 33-round magazine is compatible with Glock double-stack 9mm handguns, including the G17, G19, and G26. This extended mag is built for durability, with a tough steel frame and impact-resistant polymer shell to withstand harsh conditions. It includes an anti-tilt follower for reliable feeding, a steel spring, and durable steel feed lips. Rear-facing witness holes let you quickly check round count, and the removable polymer base plate makes cleaning easy.

XTech Tactical

XTech Tactical’s MAG Series extended magazines are highly regarded for their reliability and innovative design. Their Glock 19 extended mags come in 15-, 17-, and 21-round options, offering solutions for both capacity and compliance needs.

Why XTech Tactical Stands Out:

• Proven Durability: XTech’s 20-round magazine passes rigorous military-grade drop tests and features FOUR points of contact for exceptional impact resistance—superior to the set screw retention systems used by competitors.
• Reliable Feeding: Designed for smooth, consistent feeding to minimize jams.
• Ease of Use: Available sleeves help extend the grip for improved comfort and control.
• Compliance Options: 15- and 17-round models are available for states with magazine capacity restrictions.
• Made in the USA: XTech Tactical is known for its high-quality manufacturing and support for American jobs.

Benefits of Using an Extended Magazine

• Increased Capacity: More rounds mean fewer reloads in the range, competition, or defense situations.
• Enhanced Grip: Larger magazines with sleeves can improve grip for shooters with larger hands.
• Versatility: Useful for backup mags, range days, or competitions.

Frequently Asked Questions (FAQs)

Q: Will a Glock 17 or 21-round magazine fit my Glock 19?

A: Yes! Glock 19 can use any double-stack 9mm Glock magazine designed for the 17, 19, or 34. The magazine may protrude from the grip, but it will function reliably.

Q: Are extended magazines legal in my state?

A: Magazine capacity laws vary by state (some limit to 10 or 15 rounds). Always check your local and state laws before purchasing.

Q: Does a larger magazine affect reliability?

A: Quality brands like XTech Tactical and Glock OEM design their extended magazines for reliable function. Cheap or poorly made mags can cause feeding problems.

Q: Do extended magazines make the gun harder to conceal?

A: Yes, magazines longer than the standard 15-round mag will protrude from the grip, making concealed carry more challenging.

Q: How do I maintain my extended magazine?

A: Regularly disassemble and clean your magazines, especially after heavy use or exposure to dirt and moisture. Follow the manufacturer’s cleaning instructions.

Glock 19 Extended Mags from XTech Tactical 

Upgrading your Glock 19 with an extended magazine can give you more rounds, improved handling, and greater flexibility. For the best in reliability and durability, XTech Tactical offers a full range of extended capacity magazines for your Glock 19, Glock 45, or any pistol built on a Glock 19-sized frame. 

If you want to increase grip length with a 17-round magazine and sleeve, or you need the most dependable extended mag for backup or competition use, our selection has you covered. 

Our 21-round magazines are class-compliant in length, pass rigorous military-grade drop tests, and feature four points of contact for superior impact resistance—far more secure than the set screw retention systems used by competitors.