It just works! - Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter

I bought this for my first AR-9 build since I had a couple spare lowers and didn’t want to spend money on a dedicated 9mm lower. I did also order Stern’s Glock compatible bolt just to be on the safe side.

I have had it in and out of a receiver two or three times with zero variance in performance. I have perhaps 250 rounds using this adapter and have had zero misfeeds or malfunctions.

I decided to leave mine in its own receiver and installed a bullet button as an extra lock to prevent accidentally pressing the traditional mag release. I actually like the location of the mag release on the adapter since it is literally straight forward of the trigger guard.