I just assembled my lower receiver last night and it was so much fun. This can be addictive! It was way easier than I expected and i'm tracking coming in less than $600 for the entire build. As is detailed in the second video, my lower receiver came from Fat Boy Tactical out of Oklahoma
http://www.fatboytactical.net" onclick="window.open(this.href);return false;. It was a blemished lower for $39. I could not find any real blemishes. That thing was perfect! I purchased the lpk from Palmetto State armory. I got the PTAC Blackhawk lpk for $79. Altogether, I've spent just under $150 including S&H and FFL transfer fees. Sweet! Still trying to decide on which complete upper to buy.
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http://youtube.com/watch?v=wGyXv-v2sB0[/youtube] This is my pre build review
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http://youtube.com/watch?v=ESAGYbp_SDI[/youtube] Post build assessment.
I studied a bunch of great youtube videos before I attempted the build. There are so many out there. That made this project a snap! I feel like I learned so much about the workings of the rifle and am confident I will be able to repair and maintain it well.

Armed not dangerous but potentially lethal.
CHL Application mailed 10/2/12
Plastic in hand 11/16/12