Another bad review for this poor item - American Tactical Imports AR-15 Mag Well Adapter, 9mm, Glock

Mag release is in a bad spot, and relies on mags with a left side cut. So it won't work with a handful of aftermarket mags along with 3d printed ones. Biggest gripe is the BHO wire, just like everyone else, mine looked like a toothless beaver chewed a hole through the pinned holding point, just horrible machine skills like a middle school kid with a dremmel and shaky hands. Had to remake the entire wire with a coat hanger because the wire was bent wrong as to not even line up with the follower's spot for empty mag. The whole thing was loose in my lower's magwell, had to 3d print a shim to take out the slop. The AR mag button would over engage and not let mags insert, so I had to put shims on the mag adapter to keep the mag catch from going in so far. The mag catch for the glock mags was sharp edged and wouldn't let mags insert either, had to sand/file it round and it still is finiky. I really wanted to use a lower I already have, but since purchasing, I found several 9mm lowers that are cheaper then this product, and I will forever wish I went that route and not wasted time and money on this item. ATI failed hard with this product....

End of day, I was capable of overcoming all those short comings and it DOES fire and function. You WILL have to be mechanically inclined to make this item work for you (assuming you get as bad an item as I had).