M3 is perfectly fine. If anything it should be buffed to 20dmg so then it is 1clip=1kill and slowest rate of fire on shotguns.
Colt needs to be 8 dmg
BAR needs to be deleted.
NO MORE STACK DAMAGE ON SHOTGUNS give shotguns low damage and low freeze
Delete knockback on crab daggers (all)
Buff the reload speed on m1 carbine