It's not pinned. Just a couple of staked set screws on the bottom. I am not sure what I need to do to adjust (tighten) a staked set screw. I'm calling Troy in the morning to see what they'll do for me. I suppose they'll want me to mail it in, which won't hurt my feelings any since it's flipping cold outside anyways, and I won't feel like shooting until it warms up a bit.
It seems like I read something about pins versus screws online, but to tell the honest truth, ar15.com gets a little hard to straighten out the important details from the unimportant details. Everybody is so set in their positions that you can't tell what's important. I tried to do a little research before I bought, but the blizzard of information was a bit overwhelming. So at the end of the day, I bought a gun that looked cool. ;-)
Regarding the charging handle, this is my first AR, so I am not familiar with the necessity or functionality of some of the upgrades. It seems to me that you can't just walk into Cabelas and find a big selection of upgradeable AR parts. If I could see it and handle it, then I could compare a little bit, and see what the upgrades get me. Does Moeller have stuff in his shop, or is it all online? I've never been in there. I should stop down there sometime and grab a NFOA shirt while I'm at it.