Here’s how to switch weapons in Just Cause 4:
- PS4: Hold Square Button
- Xbox One: Hold X Button
- PC: Hold Reload Weapon Button
This is for the default control scheme. So basically, whichever button have you set as the “reload weapon” button is the one you need to hold to change the weapon. Up to 2 weapons can be carried simultaneously.
You can look up all the controls under pause menu > options > controls > on foot.
Weapons can be picked up from enemies, from weapon boxes (found at most enemy bases) and can be requested via air drop (once you’ve unlocked the blueprints, which you get by liberating regions and from certain missions and events).