Shield Arms SAS15ME5BLK 5-Round Magazine Extension for S15 Magazine - Black Anodized Aluminum

The Shield Arms SAS15ME5BLK is a 5-round magazine extension purpose-built for S15 magazines, letting you carry more ammunition without swapping carriers or rethinking your loadout. If you run a Shield Arms S15 and want to maximize capacity, this extension bolts on cleanly and integrates with most aftermarket flared mag wells—no gunsmithing required. Black anodized aluminum construction keeps weight minimal while holding up to daily carry and range use.

What sets this extension apart is the thoughtful design: machined index cuts on the body give you better purchase when stripping mags from a pouch, and the easy-access floor plate system means you can service or clean the magazine body without disassembling the extension itself. That's a small detail that saves real time in the field or at the workbench. The extension ships with an 11-coil plus-power spring rated for the added rounds, so you get consistent feeding and reliable spring return out of the box.

Built from 6061 billet aluminum and finished in Type 2 anodize, the SAS15ME5BLK is made in the USA and designed to last. Whether you're running a dedicated competition setup, a duty-focused carry gun, or a range rig, this extension gives you the extra capacity to train longer and reload less—without compromising the compact footprint of the S15 platform. Check your local magazine capacity laws before ordering.

Key Features

• Adds 5 rounds to S15 magazine capacity
• Easy-access floor plate design for quick spring and follower service without full disassembly
• Machined index cuts on extension body for improved grip when drawing from magazine pouch
• Fits most aftermarket flared mag wells
• Includes 11-coil plus-power spring
• 6061 billet aluminum with Type 2 anodize finish
• Made in the USA

Specifications

Frequently Asked Questions

Will this S15 magazine extension fit my Shield Arms S15 mag?

Yes, this extension is designed exclusively for Shield Arms S15 magazines. It will not work with other magazine platforms.

Can I service the magazine without removing the extension?

Yes. The easy-access floor plate design lets you access the spring and follower to clean or service the magazine body while the extension stays attached.

Does this extension work with flared mag wells?

It fits most aftermarket flared mag wells, but compatibility can vary depending on the specific model. Verify fitment with your mag well before purchase if you have a less common aftermarket option.

What spring comes with the extension?

The extension ships with an 11-coil plus-power spring rated for reliable feeding and return with the added 5 rounds.