I was bored in the store yesterday, so I figured I would make an attempt at building myself an AR lower. The lower is Spikes tactical, the parts kit is Stag arms, and the buffer, tube, spring and stock are Tapco. I will post pics when I can. This is the first time i've attemted to assemble an AR, so i'm pretty stoked I've got my completed lower on layaway, I should be able to pay it off in two weeks. Then I need to find an upper. My boss told me I should be able to build a basic M4 carbine for between $650 and $700. Only problem is, parts suppliers like Brownells want that price just for a complete upper. If the price goes a little over 700, thats okay, but I want to keep cost at a minimum while still using quality parts. So, do you guys think I should do like Johnny Cash and get it "one piece at a time"? or just save up and get a complete upper and barrel? I'm also looking for suggestions as to the brand of parts I need, and a good place to get them.