I don't know the source of this graphic, but I suspect it's from someone trying to prove that there was a "gunman on the grassy knoll" in Aurora. So, let's go shopping, shall we? And let's Shop Stupid©, and pay full asking retail, too! Lessee: we want a moderately tricked out AR15, and lets get it at Cabelas . We're an ignorant but book-smart wannabe with no experience so we'll really overpay for accuracy we're never going to use anyway... toss in the tax...