Yeah, the armor makes a mowtar shell to the face only do 84 damage. Then you got the bugged ass dig-in that can make a mine do 5 damage or a mowtar not even hurt. It's fucking gay and now they are never gonna fix it. The most fun weapon in the game.
you don't actually have to research 50 cal. you can stack 2 std mgs on heavy tanks if infantry is a major concern. it weighs 10 less weight total and is about as effective.