I'd like to have some myths and mysteries cleared up for me. What exactly seperates a civilian "AR15" from the "M16"??? I hear all kinds of lightening links and drop in auto sears and crap like that for conversions but alot of people also say that they are unreliable at best and are more likely to get your face blown up with a scattering shrapnel gun reciever. How does the burst fire work? How can they set up a gun to bump off 2-3 rounds only and not just stick into full auto and therebye wasting tons of ammo? Is it true that most of the M16's issued now dont even have a full auto position due to the idea I just elaborated on "spray and pray"????