|1. 5.56NATO can't penetrate windshield of cars.
2. M193 and M855's ability to inflict large cavity doesn't work in real world.
3. 9mm has no stopping power, while .45ACP stops bad guys everytime, even one hit at fingers.
4. 7.62NATO rifles can't be controlled when in full auto.
5. M1919 is tactically inferior to MG42 simply because of its slower rate of fire (and not eronomics, weight distribution and must-have-tripod design). (This one should send to Gunny Ermey.)
and the list goes on so we can keep and show goes on.