Description
Stern Defense AR-15 9mm Conversion Adapter for Glock Magazines
Buy the Stern Defense MAG-AD9 AR-15 9mm Conversion Adapter if you want to turn a standard AR-15 lower into a 9mm PCC without buying a dedicated AR-9 lower. The Stern Glock 9mm/.40 Magazine Conversion Adapter is compatible with AR-15, M4, M16, Glock 23, Glock 21, Glock 17
The adapter lets you use affordable and widely available Glock magazines while keeping familiar AR ergonomics and controls. One of its biggest advantages is the integrated last-round bolt hold open, a feature many cheaper adapters struggle with. Users and reviewers consistently praise its durable aluminum construction, easy installation, and reliable feeding with Glock magazines.
The Stern adapter allows fast caliber changes between 5.56 and 9mm while saving money compared to building a full dedicated PCC lower.
Note- You will likely need to tune the gun for the conversion. “Tuning” mainly means balancing the buffer system, ejector alignment, and magazine positioning so the blowback 9mm AR cycles smoothly and reliably. Some fitment may be needed depending on the lower and upper combination. The Stern system has a strong reputation in the AR-9 world due to the ease and reliability of the conversion.
Made of aircraft grade aluminum
Lightweight, ergonomic design
Installs in seconds
