I have a new m&p 15 that has too many legos for my taste . The miles of rails and fancey optics , lights and lasers need to go . I tend to laugh at it when I see it like who ever built it was overcompensating for somthing . My question is whats the diff on all of the ar's ? I want a more conventional iron sights , no rails ect I just want a no b/s ar that looks more like a standard issue back in vietnam or somthing , you know the lil triangular front with the carry handle on the rear like gump had .