I have a machine shop and I'm trying to find some guidelines on how to build a rifle. Anyone know a good place to find these guidelines? I would like to build it from scratch. My friend built a mcmillan tac-50 look alike, he did a great job on it, hes a good machinist but I'm out now to outdo him!! I just need to know where to start. it looks easy and I have the reasource to do it, its all done legal everything is registered. I'm looking for something like a Barrett M82A1