Congrats on the Glock, I am partial to the 21.
I got two AR receivers, stripped, as I noted in the top post. I have shopped for some uppers and lower parts kits, and everyone is tapped. I am picky, so I won't take the first one that comes around, I want chrome lined barrels, a4 style, government cut (not M4), 16" barrel. The first one I want to set it up with flip-up BUIS and an Trijicon ACOG sight. I might settle for an EoTech. I might build the second lower the same to give to my son when he gets bigger or do a bull barreled varminter, haven't made up my mind. .223 is expensive these days!
BTS