Shield Arms G17ME5BLK Magazine Extension for Full Size Glock, 5rd (9mm) / 4rd (40S&W), Black Aluminum

The Shield Arms G17ME5BLK is a precision-engineered magazine extension for full-size Glock pistols that adds serious capacity without sacrificing reliability or ease of maintenance. Whether you're running a Glock 19 in 9mm or a Glock 23 in .40 S&W, this billet aluminum extension delivers an extra 5 rounds (9mm) or 4 rounds (.40 S&W) while maintaining the ergonomic profile shooters expect from quality Glock accessories. Built from 6061 aluminum and finished with Type 2 hard anodizing, it's designed to handle the demands of training, competition, and defensive carry.

What sets this extension apart is the thoughtful engineering behind it. The unique easy-access floor plate design lets you service the magazine spring and follower without ever removing the extension from the mag body—a real time-saver when you're maintaining gear. Index cuts machined into the body give you better purchase when stripping mags from a pouch, and it plays nicely with most aftermarket flared mag wells. Shield Arms backs every extension with their Spring for Life guarantee and a 100% lifetime warranty, so you know you're investing in gear that will last.

This extension fits OEM Glock 13 and 15-round magazines and ships complete with a +10% power spring matched to handle the extra rounds. Made in the USA, it's the kind of upgrade that keeps you training longer on your current magazine supply without compromise. Note that the magazine itself is not included—this is purely the extension and spring.

Key Features

• Easy-access floor plate design for quick spring and follower service without removal from mag body
• Machined index cuts improve grip and control during magazine changes
• Billet 6061 aluminum construction with Type 2 hard anodizing for durability
• Includes +10% power spring for reliable feeding at extended capacity
• Compatible with OEM Glock 13 and 15-round magazines
• Works with most aftermarket flared mag wells
• Lifetime warranty and Shield Arms Spring for Life guarantee
• Made in the USA

Specifications

Frequently Asked Questions

Will this extension work with my Glock 19 and Glock 23?

Yes. The Shield Arms G17ME5BLK adds 5 rounds to 9mm Glock 19 magazines and 4 rounds to .40 S&W Glock 23 magazines. It fits OEM Glock 13 and 15-round magazine bodies only.

Does this work with aftermarket magazine wells?

It's compatible with most aftermarket flared mag wells, though fit can vary by design. If you're running a specific aftermarket well, verify compatibility with the manufacturer or check user reports for that pairing.

What's included, and do I need to buy a magazine separately?

The extension comes with a +10% power spring. However, the magazine body itself is not included—you'll need OEM Glock 13 or 15-round magazines to use this extension.

How do I maintain the magazine without disassembling the extension?

The unique easy-access floor plate design allows you to quickly access and service the spring and follower without removing the extension from the magazine body, making routine cleaning and maintenance much faster.