Um... the difference in the AR15 and M16 is a hole in the lower receiver, an auto sear/pin/spring, and a different safety/disconnector.
It’s beyond fair to lump them into the same thing. And GP is right, there is currently no overall better personal defensive weapon in the world than the AR15/M16.
It’s beyond fair to lump them into the same thing. And GP is right, there is currently no overall better personal defensive weapon in the world than the AR15/M16.