You're welcome.
This AR experience has been great for me. This time last year, I'd never even fired an assault rifle, nor ever even given serious consideration to picking one up. Then over the summer I shot one for the first time and was hooked. Since then I bought my own and added about $350 worth of upgrades, with another $250 coming this weekend (I'm getting the Magpul UBR stock). I've done a ton of research, and I've also installed everything myself with no outside assistance. That's a great feeling, too, especially for somebody who never really considered himself very mechanically inclined.
I'm starting to run out of stuff to replace, though. Perhaps I'll start assembling a .762 upper.