It sounds like SGT has a few R&D irons in the fire at the moment and 2014 will see some exciting new products.
A few months back, SGT published pics of an experimental forged receiver set. Additional pics today on their Facebook page of a more refined attempt. Still a little way to go, but the implications are dramatic.
Currently it’s unrealistic to convert RS forged lowers for PTW, for a variety of reasons – some legal, depending on country, and some technical. Converted forged RS uppers are around, but are like hen’s teeth and, again, depending on country they can present potential legal quandaries.
Who knows? We could soon be able to choose receivers not only with forge marks, but which have been forged per se.