Ok, ok. As you can tell, I am new to this forum. I just bought my MG3 parts set from FTF industries on Gunbroker about 1 month ago. I joined this forum a few days ago. I always wanted to make a SA-42, so I looked for receivers for my parts set, and all I could find right now is BRP sheet metal, PhilaOrd, and IMA's last few cut receivers. So after much perusing of this enormous forum, I have learned that the best Semi build is indeed done with a cut up receiver, so yesterday I purchased a hand-selected IMA cut up receiver. I guess that for me, everything written above can be disregarded, but it is good for reference, and it will help anyone who misses out on the last IMA receivers. Also, how difficult is it to build a Semi-auto with the sheet metal stampings of the rear receiver that BRP is offering right now? When I get my receiver pieces, I will compare them with BRP's stampings (no, I have not bought the stampings), and maybe I will be able to build a S/A with BRP's parts... Anyone try this, or have experiences with this? Thanks guys!