Hello to all, hope your want to complete your kit pans out. I feel that all ideas working toward doing a build will get the job done. It took me a long time to complete my 42. It is not all that hard. I built mine as per my own design. maybe a little more complex than others, but still works well enough. The trigger group is welded to the receiver, parts installed through the top with neddle nose pliers. Made my own bolt with spring plunger ejector. Still use 42 safety, ar-15 trigger, buffer and recoil spring shortened 2". There is NO way that the FA bolt will install into the gun. TIG welded the receiver together. Lots of fun to build your own 42. Good luck to all.
Weasel