I'm not sure if I can or not. I have a crowbar in hand and a rifle over my shoulder but I'm not sure I can use it?
~DAMN YOU NEO SCAVENGER!
You cannot directly use them for fighting. However, when in combat, if you are away from enemy, outside of his weapon range, you can access your inventory to move your weapon. In case of enemies with loaded, ranged weapons, you need to duck into cover before entering the inventory screen. Be careful, as changing weapon will cost you a offensive move - cannot attack with weapon in the turn you took it in hand.
Got yea thank you.