So Im about to get a Ar-15 - I think the M4 version. A3 flattop. The question is anyone have advice or reccommendations? I also want to get an EOTech. My local gunstore has a bushmaster A3 without the attachable carry handel for $850 and the Eotech for $300 and the attachable flip up iron sight for $110. Are these average prices? Is the 16" barrel better than a 20". No, I am not a mercinary.