No affiliation with them......just wanted to let others know these are out there. I ended up getting the cheap barrel only jigs when I was going to weld one so it is nice to see these back.
Uzi Jig Set - Appalachian Arms
Our Uzi welding jigs are here! Expertly CNC machined from 6160 aluminum. Designed to perfectly align the receiver pieces and prevent warping during welding.
apparmsco.com