Works really well so far, only issue was upon initial installation I had an issue where I couldn’t cycle the action. But with some minor adjustments of the screws I was able to make it run smooth, overall would recommend

I have to say how pleasantly surprised I was with this mag adapter. To be honest, I didn’t have a ton of confidence on how smoothly this would operate. To my surprise, I didn’t have a single failure of any sort in my first range trip of about 200 rounds and that’s with magpul mags so that’s saying something!
It’s going to take a little getting accustomed to the location of the mag release but it’s comfortable and makes sense. It is absolutely incredible that you can have a 9mm ar and switch to a bunch of different calibers with one Allen key and a new upper in a matter of seconds!

Thanks Stern Defense,
I’m overjoyed at the simplicity and effectiveness of this product especially paired with your bolt and barrel.

Polished metal fed ramp. Installed <15 mins ran 500rds cycles like a Singer Sewing Machine...

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.