le/military

So the AR15 platform is pretty customizable from the looks of it. So far I've picked up a keymod rail, and am looking at getting some Vortex optics for it this weekend. Just wondering what else are the best/most common accessories for an AR15

Pretty much as the title states, I know that Glock and Sig does some special pricing for Military and Law Enforcement, and the prices are good if you can locate the dealers, here in N.E Ohio the only one that I know of is Atwell's out in Painesville, OH; Anybody else know of any of the other...