This is a dedicated 9mm lower receiver machined from 7075 aluminum by Double Diamond Law Enforcement Supply (DDLES), who sold out to what is now Quarter Circle 10. This receiver accepts colt pattern 9mm magazines. Includes a complete lower parts kit (colt) with an ALG QMS trigger. The receiver has ~1100 rounds on it and was recently sand blasted to prep for Cerakote, but I decided to abandon the project.
Manufacturer’s link: https://www.quartercircle10.com/products/receivers/lower-receivers/clt9mm-lower-receiver.html
$215 shipped to your FFL