So I don't actually have the lower yet (I tried to buy it Monday but the system was down so I couldn't get the background check done) anyway, I am going to need an upper. I am looking for something pretty general purpose, nothing special. I am hoping to stay sub $600 on the thing so don't go crazy, preferably in 5.56. I am also just looking for now, wont be buying for a while, so if you know of a place that has regular sales or anything, that would be good too. Thanks in advance!