Mag-AD 9mm / .40 S&W Glock Magazine Adapter
Revolutionizing AR Builds. Designed, Machined, and Assembled in Our Factory.
The Mag-AD 9mm / .40 S&W Glock Magazine Adapter is Stern Defense’s flagship product, the one that put us on the map. Trusted by law enforcement and civilian gun enthusiasts alike, this adapter allows you to quickly convert your standard mil-spec AR-15, M4, or M16 lower assembly to accept Glock 9mm and .40 S&W magazines.
Crafted entirely in-house at our factory, every aspect of the Mag-AD is meticulously designed and built to ensure superior performance, quality, and precision. The adapter boasts a last round hold open feature, a breakthrough innovation that elevates the shooting experience—making it a must-have for anyone looking to enhance their AR build.
✅ Why Choose the Mag-AD?
- Quick Installation: Installs in seconds, transforming your AR-15 lower into a 9mm or .40 S&W Glock mag-compatible firearm
- Last Round Hold Open: A critical feature for reliability and functionality, ideal for both law enforcement and civilian use
- Lightweight & Ergonomic: Constructed from 6061 T6 aircraft-grade aluminum for optimal performance and comfort
- Durable: Features a 4140 NiB-coated feed ramp and Type 3 hard coat anodization for wear resistance
⚙️ Technical Information
- Material: Constructed from 6061 T6 aircraft-grade aluminum
- Feed Ramp: 4140 NiB-coated for durability
- Finish: Hard coat anodized Type 3 for maximum wear protection
- Mag Release: Ergonomically designed for ease of use
- Compatibility: Works with any mil-spec AR-15 lower receiver
- Bolt and Barrel: Requires a 9mm or .40 S&W barrel (depending on caliber) and a Glock-cut bolt
- Stock Components: All components remain stock, except for the bolt and barrel
⚠️ Important Notes
- Buffer Requirement: Must be used with a 5.4-ounce buffer or heavier when using a carbine spring.
Click here for the recommended buffer - Compatibility Check: Be sure to check compatibility with your setup before purchasing.
Click here to confirm compatibility
✅ Looking for a Complete Conversion Kit?
We’ve got you covered with everything you need to get started.
Transform Your AR Build Today
The Mag-AD 9mm / .40 S&W Glock Magazine Adapter is more than just a product—it’s an essential upgrade for anyone looking to get the most out of their AR-15 build. Whether you’re in law enforcement, competition shooting, or a civilian enthusiast, Stern Defense brings you the best in quality, performance, and reliability—all crafted right here in our factory.
