Originally Posted by RonPaul2012
Alrighty, Thanks! And which parts must I register? Just the lower receiver, right?
Nothing needs to be registered!
If you buy a complete receiver like NODAK you will need it to go through a FFL for transfer.
If you fold your own receiver from a flat like a AK Builder flat there is no record of the gun & it doesn't need to go through the BATF.
Centerfire is a ok place to buy from, but there quality is very iffy.
You got the right idea, you need a kit that doesn't need the barrel replaced or has already had the barrel replaced for your first build.
Here are a few links to kits of this kind.
Remember on your first build you won't save any $$ doing it your self but you will come away with the knowledge & tools to do it again!
Good Luck with your build!