A gift from stern to us humble m9 lovers - Stern Defense MAG-ADB92 AR-15 Beretta 92 9mm Magazine Conversion Adapter

I purchased this to make an AR-9, and this was the only magwell adapter (or any lower receiver option) for M9 Baretta magazines that I could find. Luckily, it's everything that I want. Easy to install, durable, LRBHO compatible, works with all of my M9 magazines (m9a3,m9a4, military surplus m9 magazines) and it caused 0 malfunctiones in my first 500 rounds through the rifle so far. If you want to build an AR-9 that takes Baretta magazines, this is your solution. I highly recommend it.

Notes: I am using a PSA lower receiver, a Geissele 2 stage trigger, an Aero precision upper, Ballistic advantage barrel, and JP enterprises combination 9mm BCG and silent capture buffer system with 2 tungsten weights. If you are struggling with research and trying to build an AR-9, I hope this helps.