BadWolfe

I am also having this issue. I've rebound the aim/block button to the number 4 button on my mouse. Whenever I press the number 4 button, whether on the mouse or key board, my weapon automatically switches from what ever I am using to the weapon in the number 1 slot on the character inventory screen. If I have no weapon in the number 1 slot the aim/block work as intended for the other weapons I have equipped.