I came across a complete M1A1 Thompson kit that includes cut receiver halves. Searching on line, I have read and seen photos describing the build process where these kits have been made in to semi-auto only NFA Short Barreled Rifles. I also found commentary that said rewelded demilled receivers were legal in the past, but BATFE changed their stance on this. I went to the BATFE website to see if Q&A existed about this, but found nothing there on the topic. Insight welcome and appreciated, thanks.