https://midstatefirearms.com/product/sylvan-arms-9mm-ar-glock-magazine-adapter/

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The Sylvan Arms 9mm Glock Conversion Block converts your AR-15 lower to a 9mm Lower using Glock magazines.

Our Glock Conversion Block is built to handle any standard mil spec lowers with most 9mm uppers.
The Sylvan Arms Magwell adapter works with Glock 17 and Glock 19 magazines.
Built of 60601 aircraft grade aluminum.
100% satisfaction guarantee.
limited lifetime warranty
Designed, built, and assembled in the USA.

Check it out in action: https://youtu.be/QJ-QSutw3o4