Love it. I think this is the only magazine adapter with last bolt open. Very easy to install. After installing it, empty magazines weren't catching and would just pull out. I had to hit the bottom of the magazine several times for it to seat. After that the magazines fit and seat perfectly. I wish there was a slight cant outerward to the magazine release button. It would feel more natural and save your finger tips after several releases.

Love it. While waiting for parts to finish my build placed it on another ar pistol and is so easy to change back and forth.

Thanks ester defense
This item is great I revived and used 250 rd and not even menor issue MAG-AD9

Being ex-law enforcement, we strive to find the best products on the market for our customers . A large majority of them are current LEO, Military and EMS so it is a huge pride thing for us to be able to build and mod their platforms. Don't think we aren't concerned about our other civilian customers; that would be an outright lie. Every build, every mod leaves our hands as if we were going back in harms way with it. We buy and test products before we ever offer them for sale to make sure we offer the best parts available. If they can handle what we do to them, then you should never have a problem. Upon testing, we are very pleased to announce we will be stocking these in our shop. The fit and funtion is far superior over anything else I have seen of its kind. Add the fact that they have several magazine platforms to choose from; it is going to make building your dream AR a reality. Thank you.

First time to the range with no malfunctions at all. This is very well made and install was very easy.

I was skeptical at first but after using the AD9 it works flawlessly. it gives me the capability of using one lower for multiple calibers. Thank you Stern Defense for making a great product.

I've spent hours online researching who make the best adapter.. These guys and girls are the best!!! Well made, and very,very good customer service! I couldn't be happier!

This worked great with my PSA lower and 9MM upper. Only 1 jam out of 100 rounds but appeared to be due to the magazine I was using. I would recommend!!

This item is well made and works exactly as advertised. A lot of thought , engineering and craftmanship was applied in building this adapter. There are other adapters out there but looks , function, fit and finish can't hold a candle to the Stern Defense Mag adapters. I have 9mm and 45 ACP. Love them both.