Optics are a significant consideration. An AR pistol must have an optic that is not difficult to pick up and use quickly (The very last thing you want to mount on this gun is often a scope.) The 601 and 602 are virtually identical to the later M16 rifle with https://travisvpjcv.oblogation.com/20195950/how-much-you-need-to-expect-you-ll-pay-for-a-good-ar-15-rifle-caliber