gjohnsoniv

I am new to the whole sbr/class III things and have a couple of questions. First, what forms do I need to fill out for a short barreled rifle? Second, what barrel length would you recommend. Finally, what muzzle break or flash suppressor would be the best to use?

Another question I have is over the lower. If I build an sbr, can I put a non-sbr upper on it, or does the short barrel upper have to stay on the short barrel lower? In other words can I use my existing lower and have it engraved after the paperwork comes back, but also use it for my 20" barrel upper?

I hope you don't mind if I jump in on this thread as well. I have also been wanting to make a short barreled rifle, but can that be done at 19, off of the form I? I talked to my local gun store owner and he said that he wasn't really sure, and the opinions online vary.