I happened on this sight about a month ago and I've been lurking since. A friend of mine is building his first Ar and kept telling be about it and gave me the bug. I started with a pof lower and a timmey 2 stage trigger. After doing more research on what I wanted I ended up ordering a stripped mega upper/lower, stock, and lower parts kit the other day. I have an older sig 239 that has seen no use. That is going to change this summer though. Glad I found this site!