Well, I've seen AR-15's on the television and at gun shows but I've never really looked into them. Just the other day I was looking at them and found that I was quite fond of them. I dont know that much about them. I've heard you guys talking apout uppers and lowers and H-BAR and 1,2,3 and so on but that doesn't make a bit of sense to me. All I know is that I want a pre-ban that shoots semi-auto, full-auto, and bursts. I really don't know anything about anything else.I DO want a Colt. Please fill me in on all of this upper, lower,H-BAR,1,2,3, and if it's even possible to get one with the functions i listed above. I really appreciate you all for your time.