Armantarium is ok, but I've noticed it still end up often with only one granade because you throw one more often then they recharge. Ruin wings doesn't help AT ALL. If anything heavy ammo drops less, only pro is when it FINALLY does drop, you get 4. And sometimes I'll be just messing around and most often when I need it most, I'll get more heavy drops than I need, I've never gotten this when I actually need it