Thanks for the responses.
Shamayim, my front sight post sounds like it's forged based on your description (approx. 1/8" seam on front and back surface of tower). The primary reason I thought it was cast was because of the seam (shows how much I know).
Anyway, thanks again for the responses. The upper looks great and I got it for a great price ($355 complete with bolt carrier, charging handle, detachable carry handle, and OD green M4 style handguards). For some reason the charging handle came without the latch, latch spring, and latch roll pin, but it should only cost me about $3.00 for that stuff, so I won't complain! I'm going to build this on an Eagle Arms lower, so it should hopefully be a pretty good combination (this will be my first AR), although I have noticed the colors on the Eagle lower are slightly different than the RRA upper. Oh well... I guess it just makes my rifle a little more "unique."