Shield Mag Extension +5/4 for Glock 19/23 - Gold Finish

The Shield Arms Mag Extension +5/4 for Glock 19/23 in gold finish is a billet aluminum magazine extension designed to boost your carry or duty mag capacity. For Glock 19 owners shooting 9mm, this extension adds 5 rounds to standard magazines; G23 .40 S&W shooters gain 4 extra rounds. It's a straightforward way to increase on-board ammo without swapping platforms, and the gold anodize gives it a distinctive look on the bench or in the holster.

Shield Arms engineered this extension with a floor plate design that lets you access the spring and follower for cleaning or maintenance without having to disassemble the whole mag—a practical touch if you run suppressed or shoot corrosive ammo. Machined from billet 6061 aluminum and Type 2 anodized, it's built to handle regular use. The body includes index cuts that improve grip when you're stripping mags from a pouch under stress. Installation fits OEM Glock 13 and 15 round magazines, and it plays well with most aftermarket flared mag wells for modernized frames.

Shield Arms includes a spring with increased power to handle the extra round stack, so feeding is reliable out of the box. Made in the USA, this extension is a solid upgrade if you want more ammo in the same footprint—useful for competition, training, or everyday carry where mag real estate matters.

Key Features

• Adds 5 rounds to Glock 19 9mm magazines; 4 rounds to Glock 23 .40 S&W magazines
• Easy-access floor plate allows spring and follower service without full disassembly
• Index cuts on body improve grip and retention in magazine pouches
• Machined billet 6061 aluminum with Type 2 anodize in gold finish
• Compatible with OEM Glock 13 and 15 round magazines
• Works with most aftermarket flared mag wells
• Includes +10% power spring for reliable feeding with extended stack
• USA-made

Specifications

Frequently Asked Questions

Will this extension fit my Glock 19 or Glock 23?

Yes. The extension is designed for both the Glock 19 (9mm) and Glock 23 (.40 S&W). It fits OEM Glock 13 and 15 round magazines and works with most aftermarket flared mag wells.

How many extra rounds does it add?

The extension adds 5 rounds to a standard Glock 19 magazine and 4 rounds to a Glock 23 magazine.

What's included in the box?

The extension comes with a +10% power spring designed to reliably feed the increased round stack.

Can I clean my magazine without removing the extension?

Yes. The easy-access floor plate allows you to remove the spring and follower for cleaning or maintenance without having to fully disassemble the extension from the magazine body.