First , thanks to Quentin for the pointer to PSA, Palmetto State Armory; and his encouragement. Second, thanks to "Building Your AR-15 from scratch" , by Lenny Magill, from www.gunvideo.com. This video is very clear and understandable. I THINK I bought the video at Sportsmans WH. Also, AgentTikki has a great write-up in the AR15 subforum ... it has a sticky, so it should be on the first page. I didn't read until I was almost done. But it is very well-written and clear. I started off with a stripped lower receiver from PSA. That had to be sent to an FFL dealer. I used my gun club, Whistling Pines , in Colorado Springs. I paid $46.99 for it , including shipping. It is an ATI Omni. It's fine, at the time I bought it, that was all they had in stock. I will probably replace it at some point, but maybe not. I bought that on 10/2/12.