Awesome product, but watch your mag choice - Stern Defense MAG-ADMP9&40/P320 AR-15 M&P 9mm/.40 Magazine Conversion Adapter

I found this product after seeing a competing one on TGC News. Being a cheapskate, I was hesitant to spend $50 more on this than the competitor, however I’m glad I did for 2 reasons: 1 - Location of Mag release allows for dropping the mag with your trigger finger, no wasted motions for your support hand 2 - LRBHO! Now, the cons: it’s picky about mags. ETS? Ha NO. ProMag? Don’t even think about it. Is that the end of the world? Not to me, but ymmv. They clearly designed this for use with OEM mags and I can’t fault them for it.