I am looking to build my M92 kit as a 7.62x39 pistol untill I get the funds and the paperwork to SBR it. I have an NDS m92 receiver and it has the holes for the underfolder in it. If I use a virgin rear trunnion with no holes for the stock, would it still be a legitimate pistol? I don't think I have ever seen anyone do this before, and was wondering if there was a reason for it. The receiver has never been a rifle, and there is way to install a stock without major work. I will write a letter to ATF to make sure it's ok, but wanted to get the forums take on my idea.