Shield Arms 5-Round Magazine Extension for Magpul PMAG Gen M3 - Black Anodized Aluminum

The Shield Arms 5-Round Magazine Extension for Magpul PMAG Gen M3 gives you more rounds downrange without swapping magazines. Built from billet 6061 aluminum and finished in type 2 black anodize, this extension adds 5 rounds to your existing Gen M3 PMAG, boosting capacity while maintaining the reliability you depend on. Whether you're running drills at the range, training for a competition, or preparing for duty use, extra ammunition on tap means fewer mag changes and more time focused on your shots.

Shield Arms engineered this extension with a user-friendly floor plate design that lets you access the spring and follower without removing the extension from the magazine body—a genuine convenience when you're maintaining your gear. The extension features index cuts on the body for a solid, indexed fit and is machined to work seamlessly with the factory spring. It's USA-made, fits most aftermarket flared mag wells, and carries a lifetime warranty backing the craftsmanship.

If you're running M3 PMAGs and want to increase your ready capacity, this is a straightforward, proven way to get there without sacrificing quality or reliability.

Key Features

• Adds 5 rounds to Magpul PMAG Gen M3
• Billet 6061 aluminum construction, type 2 black anodized finish
• Easy-access floor plate design for quick spring and follower service
• Index cuts on extension body for secure, repeatable fit
• Compatible with OEM Magpul spring
• Fits most aftermarket flared mag wells
• USA-made with lifetime warranty

Specifications

Frequently Asked Questions

Will this Shield Arms extension fit my PMAG Gen 2?

Yes, Shield Arms designed this extension to work with both Gen 2 and Gen 3 Magpul PMAGs. Make sure you have a Gen M3 model to ensure proper fit.

Can I use the factory Magpul spring with this extension?

Yes, the extension is designed to work with the OEM Magpul spring, so you don't need to purchase additional internals.

Does the extension fit my mag well?

The Shield Arms extension fits most aftermarket flared mag wells. If you're using a precision or competition mag well, we recommend confirming compatibility with your specific platform before ordering.

How do I access the spring and follower for cleaning or maintenance?

The unique floor plate design lets you quickly access the spring and follower without removing the extension from the magazine body, making field cleaning and maintenance faster and easier.