whats even worse than that, is that some people think just because an M4 has a slightly longer barrel than what they think the normal length is (like colt commando length), they automatically think that its an M16. they think that just because the barrel doesn't stop at the front sight that it's not an M4. I hate people that aren't educated about firearms
It is because they get all their info from COD, what makes it really bad is when the think that weapons of the same caliber damage differently, especially with weapons like the FAMAS and FN F2000.