Stern Defense 9mm AD-9 Conversion

Published on September 4, 2019
Duration: 12:28

This guide details the installation and operation of the Stern Defense AD-9 9mm conversion kit for AR-15 platforms. It covers the simple 5-minute installation process, emphasizing the unique magazine release mechanism and compatibility with various pistol magazines. The video also showcases the system's performance with different ammunition types and accessories, offering insights from an experienced firearms instructor.

Quick Summary

The Stern Defense AD-9 is a 9mm conversion kit for AR-15 lowers, allowing use of pistol magazines like Glock, Sig P320, and M&P. Installation takes about 5 minutes, utilizing the bolt catch as the magazine release. It offers reliable feeding and good accuracy for a PCC build.

Chapters

  1. 00:00Introduction and Initial Shooting
  2. 00:37System Overview and Ammo
  3. 01:09Technical Specs and Compatibility
  4. 03:00Manual of Arms
  5. 05:05Defensive Ammo Testing
  6. 07:24Accuracy and Suppressor
  7. 08:20Full-Auto Glock Conversion

Frequently Asked Questions

What is the Stern Defense AD-9?

The Stern Defense AD-9 is a conversion kit that allows a standard AR-15 lower receiver to reliably fire 9mm Luger ammunition, effectively turning it into a Pistol Caliber Carbine (PCC). It installs easily and uses common pistol magazines.

How do you install the Stern Defense AD-9 conversion kit?

Installation is straightforward and takes approximately five minutes. It involves removing the AR-15 bolt catch, inserting the AD-9 adapter, and reinstalling the bolt catch, which then serves as the adapter's magazine release.

What magazines are compatible with the Stern Defense AD-9?

The AD-9 conversion kit is available in versions compatible with popular pistol magazines, including those for the Sig Sauer P320, Smith & Wesson M&P, and various Glock models. Users must select the adapter version that matches their desired magazine type.

What are the accuracy expectations for the AD-9 conversion?

During testing with a 4-inch barrel, the AD-9 conversion achieved a softball-sized group at 75 yards. This indicates respectable accuracy for a 9mm PCC setup, especially when paired with appropriate ammunition and optics.

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