Now here are some additional pics of the next build, as discussed above:
The ejector MIG welded in, along with plug welds for the barrel collar:
https://www.milsurps.com/images/impo...PA052674-1.jpg
https://www.milsurps.com/images/impo...PA052675-1.jpg
Here we see the welds cleaned up with a file:
https://www.milsurps.com/images/impo...PA052676-1.jpg
Here is an inside view of the ejector:
https://www.milsurps.com/images/impo...PA052678-1.jpg
Here the trigger plate tabs are just tack welded on, but the trigger plate collar has been welded across the bottom at the back of the tube, tacked at the corner joints and solidly welded at the top of the tube. Welding done with a MIG machine.
https://www.milsurps.com/images/impo...PA052679-1.jpg
https://www.milsurps.com/images/impo...PA052680-1.jpg