The Shield Arms Magazine Extension for Glock 19/23 is a straightforward way to squeeze more rounds into your carry or duty mag. If you run a Glock 19, this extension adds 5 rounds to your magazine; Glock 23 shooters gain 4 rounds. It's made from billet 6061 aluminum with Type 2 anodize for durability, and the design includes index cuts on the body for a solid, consistent fit. Fits OEM Glock 13 and 15 round magazines only, and is compatible with most aftermarket flared mag wells if you're running a magwell on your platform.

The real standout feature here is the easy-access floor plate. You can pull the spring and follower without detaching the extension from the mag body—handy if you're doing maintenance or rebuilding on the fly. Shield Arms includes a +10% power spring with the extension to handle the added capacity and maintain reliable feeding and function.

Built in the USA, this extension is a no-nonsense upgrade for shooters who want more ammo on tap without swapping mags. Whether you're building a duty rig, a competition setup, or just want extra capacity in your carry gun, this piece does its job cleanly and fits where it needs to fit.

Key Features

• Adds 5 rounds to Glock 19 magazines; 4 rounds to Glock 23 magazines
• Easy-access floor plate design for quick spring and follower access
• Machined billet 6061 aluminum with Type 2 anodize finish
• Index cuts on extension body for secure, consistent fit
• Includes +10% power spring for reliable feeding at capacity
• USA manufactured
• Compatible with most aftermarket flared mag wells

Specifications

Brand	Shield Arms
Compatibility	Glock 19/23 (OEM 13 and 15 round magazines only)
Material	Billet 6061 aluminum
Finish	Type 2 anodize
Capacity Increase	+5 (Glock 19), +4 (Glock 23)
Included Spring	+10% power spring
Made In	USA

Frequently Asked Questions

Will this extension work with my Glock 19 or 23?

Yes, the Shield Arms extension is designed specifically for Glock 19 and 23 pistols. It fits OEM Glock 13 and 15 round magazines only—check that you're using factory Glock magazines for proper fit and function.

Does it work with my aftermarket mag well?

The extension is compatible with most aftermarket flared mag wells, though fitment can vary depending on the specific design. If you run a mag well, check compatibility before purchase.

What's included?

The extension comes with a +10% power spring designed to handle the increased round count and maintain reliable feeding at full capacity.

Can I remove the spring and follower without taking the extension apart?

Yes—that's a key feature of this extension. The easy-access floor plate design lets you quickly access the spring and follower without detaching the extension from the magazine body, making maintenance and rebuilds faster.