The Amigo Grande is a G3-like rifle that is based specifically around a CETME C parts kit as a lot of those have flooded the market lately. When they dry up this build will probably become less popular. IvanTheTroll is the listed developer along with Gatalog and someone called fuddbusters.
This build is not for the faint of heart. It involves a lot of dremel metalwork and should probably not be attempted by amateurs.
https://ctrlpew.com/file-drop-the-amigo-grande/
https://odysee.com/@TheGatalog-PrintableFramesReceivers:9/Amigo-Grande-Release-Rev3:b