Hey guys! Most of you are lucky enough to own one of these beauties and I wanna join the club. I don't really have the funds for it right now but might be able to start purchasing parts little by little sometime in the near future. I got some questions though.. I was looking at stripped lowers on Impact Guns and noticed that they do not require FFL transfer. So are you required to register your AR with the ATF somehow at some point during the process of building the AR? Because a finished lower does require FFL transfer. I don't want to end up breaking the law out of ignorance so I thought I should ask first. Also, there is SO MUCH to choose from! I really like the S&W M&P 5.56mm NATO lower for $129; what do you guys think about these? What about the parts kits? I see a Rock River Arms parts kit for $70, so for about $200 I could have a complete lower. I don't expect this kit to be awesome but I think at least the S&W lower is pretty decent quality and I can eventually get a better trigger/internals if I really find it necessary.. Anyway, I'm thinking about starting with the lower since it seems like it requires the most work just to get it out of the way first. What do you guys think? Your opinions will be appreciated!