Alexanderthegreat

Hi all, I'm a new member here. I joined because I will shortly be building a .22LR tactical AR15 for plinking and practice if the government will let me. I currently have a 5.56mm ar15 bullet buttoned for home defense and target practice (whenever I want to throw cash down range). I don't know how many of you guys are from California. I'm pretty sure all you know the bull* we have to go through to get AR and AK series rifles. My questions are in building an .22LR AR15 rifle would a conversion kit be better or a dedicated upper? I'm a real big DIY and I like picking and choosing my parts for my rifle. Do they sell Dedicated uppers by themselves? Last questions is a legal one. When dropping in a .22LR conversion kit into a AR15 would it now be considered a non Assault Rifle since it's a Rimfire. Meaning I will be able to put a magazine button that works and have a rifle that measures less than 30" Thank you for all your input will try to post pictures of my current rifle and build rifle. Alex