deadly is a silly term and is based on ignorance
different environments make one weapon more "deadly than others"
for example an AR 15 is pretty worthless in a very close quarters like an elevator. Its hard to sneak up on a well guarded politician with an AR 15. Its also pretty worthless past about 600 yards unless you have a real expert.
a thousand yards away, a Tubbs 6mm target rifle with a good scope is far more deadly than an AR 15
at two feet in a crowded room, a 38 special is far more deadly as well
defending a room by covering the door-a 12 G shotgun with #4 buck is more deadly
YOu are obviously wrong