This thread seems to be a bit played out, but I'm hoping to revive it.

I've always wanted an AR, but it was not at the top of my priority list, so I don't have one yet. However, since

land is banning the sale and import of AR's on 10/1, the necessity to build one rose to the top of my list. I just bought 2 Lower receivers which I have in my hand, and 2 parts kits, one of which I already installed. Pretty straight forward build, YouTube helps a lot.
But now I'm concentrating on gathering parts for the upper receiver and barrel assembly, and not sure exactly what I want, or how to do it. So many ways to build it, and so many different parts and manufacturers, it's a nightmare for a newbie to AR's.
I said I bought 2 lower receivers. I want one for short range rifle with a Red Dot sight, or EOT, or something, and the other I want for a long range rifle. If and when the SHTF, I want to be ready for whatever comes along.
Any takers in explaining, or helping me out, or anyone else with the same idea?