I was browsing some threads on here and saw that kellyclan said that ar15.com was a great AR site. I was bored so I started looking through it, read the rifle primer and was suprised how cheap it was to build your own as compared to buying (Although the article needs updated a bit, he said that pre-ban lowers go for about $400, more like $900 from what I've seen). I browsed around the different manufacturers and came up model1sales.com. I noticed they sell both pre-ban and post-ban uppers/kits. What exactly is the difference here? I understand that you have to have a pre-ban lower for it to be considered a pre-ban rifle and all but I dont understand this upper thing. Also, anyone have an good recommendations? I don't want to buy no-name crap but some bushmaster/armalite/etc kits are pretty expensive. Model 1 seems to have pretty good deals, their kits are complete less the stripped lower. I'm just looking for something that would be fun to shoot, not for home protection or anything like that. I've been looking at 16" CAR kits and M4 kits, probably opt for and A3 upper with the removable handle or something of the likes. Anyone have any thoughts or reccomendations?