BUilding an AR-15 type rifle?

I'm looking into purchasing some sort of Semi auto rifle. I've found some pretty inexpensive AK style rifles all with mixed reviews, like the WASR-10 people either love it or hate it, lol. I've been looking AR types and most are pretty expensive. I've heard you can build them yourself for pretty... show more I'm looking into purchasing some sort of Semi auto rifle. I've found some pretty inexpensive AK style rifles all with mixed reviews, like the WASR-10 people either love it or hate it, lol. I've been looking AR types and most are pretty expensive. I've heard you can build them yourself for pretty inexpensive.

My question though, what pieces am I looking to buy to build one? Obviously the upper and lower receivers, what else?
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