And I am wondering if there is anyon e selling AR-Stuff in the Austin, Waco, Temple area, hell, even D/FW.  Namely magazines, accessories and such.  Any good ranges around Harker Keights?

Action Pawn in Killeen has about the biggest collection of stuff in the Harker Heights area. However you are about  5 minutes from the worlds largest military base. Why in the world would you pay for AR Magazines. Most of the army boys will give then to you if you ask nice.

When I lived in Waco several years ago, Praco Pawn was a surpisingly good gun shop.  I wasn't on the Black Rifle Drip back then so I don't remember what kind of AR-related stuff they have, but it's worth checking out.  

If you're looking for a place to shoot, you can't go wrong with Lloyd Llepo's Range in Copperas Cove.  You can get contact data and directions by searching for "Copperas Cove Pistol Club" in Yahoo.  Gotta call ahead and schedule a time with Lloyd - he is great people.  We shoot pistol matches every 2nd Saturday and 3 Gun matches every 4th Saturday (in NOV, think it's gonna be the 3d Saturday).  Lots of AR guys at the 3 Gun matches.