about 5 years ago - Trello - Direct link

Update If you are experiencing issues trying to Upgrade a weapon or Sidegrade your AR and are unable to, its likely because the “Use” button and “Object Carry / Sidegrade” button are set to the same keybind.

Re-binding or using a secondary key for the “Object Carry / Sidegrade” button to be different than your “Use” button should resolve these issues.

Mobile players will need to use the “Cycle Weapon” button.