So I got this lower off my dad with a parts kit, from there I have no idea what I'm going to do. I want to build a lightweight vintage gun with the short barrel, moderator, no fwd assist, etc, but for that I want a partial fence lower from NoDak. I can build the upper for that and put it on this for now, then when i have $$ go back and build a lower for it, and an upper for this. Then my friend starts talking about making it a pistol. I kinda like the idea. I didn't purchase this one so am I right in saying I can make it whatever I want? Since I didn't fill out the paperwork, and I got it face-face basically from my dad, can i do what I want? So here's the thing, if I build a pistol I would love for it to be a 9mm but I have heard most of the kits have issues. Are there ones that don't suck? Is it a far more expensive proposition to do the 9mm? Should I just build a rifle 9mm? Or just forget the whole thing and do a .223? Sorry for the train wreck of thoughts but basically what's the deal with 9mm kits?