Shield Arms CZ P10F/P09 +5/4 Magazine Extension - Black

The Shield Arms CZ P10F/P09 +5/4 magazine extension is a no-fuss way to boost your carry or duty mag capacity. This billet aluminum extension adds 5 rounds of 9mm or 4 rounds of 40 S&W to OEM CZ P10F and P09 magazines, giving you more rounds between reloads without switching to a different mag platform. Built for shooters who want reliability and ease of maintenance in one compact package.

The standout feature here is the access floor plate design—you can service the spring and follower without yanking the extension off the magazine body. That's a real convenience when you're cleaning after a range day or swapping components. Index cuts along the extension body give you a better grip when you're drawing mags from a pouch, and the machined aluminum construction is Type 2 anodized for durability. It plays nicely with most aftermarket flared mag wells, so it'll work with your favorite grip upgrades.

Shield Arms ships this extension with their +10% power spring and backs everything with a lifetime warranty and Spring for Life guarantee—no surprises down the road. Made in the USA, it fits only the newer-style P10F and P09 magazines with orange followers, so verify your mag generation before ordering.

Key Features

• Easy-access floor plate allows spring and follower service without removing the extension
• Index cuts on the extension body for improved grip and magazine pouch control
• Billet 6061 aluminum construction with Type 2 anodize finish
• Includes Shield Arms +10% power spring
• Compatible with most aftermarket flared mag wells
• Made in the USA
• Lifetime warranty with Spring for Life guarantee

Specifications

Frequently Asked Questions

Which CZ magazines does this extension fit?

This extension is designed for the new-style CZ P10F and P09 magazines with orange followers only. Do not use with older magazine generations or non-OEM mags, as fitment and reliability may be compromised.

Does the extension work with aftermarket mag wells?

Yes, it's compatible with most aftermarket flared mag wells, though fit can vary. If you're running a specific aftermarket well, verify compatibility before purchase.

Can I service the magazine without removing the extension?

Yes—that's one of the key design benefits. The easy-access floor plate lets you reach the spring and follower for cleaning or maintenance without detaching the extension from the magazine body.

What spring comes with this extension?

Each extension ships with Shield Arms' +10% power spring, engineered to handle the added capacity and backed by their Spring for Life guarantee.