One - if I've got someone already with his rifle up and shooting at me 4x per second from 15 feet, I'm kind of screwed anyway, don't you think...?
Two - "I can make u miss chest at 5m, your rifle. " No, you can't. My rifle is a compact, lightweight, low-recoiling carbine, that I can shoot one-handed with either hand and not miss that size target at that range; much less with both hands. And I've done enough no-hearing-protection shooting (which is stupid, btw, kids) to say that with confidence.