With the 0.9.0 update on Oct. 25th 2018, we have added a feature which allows you to switch your scope.

1. Press the ▲button on the bottom right of the game lobby screen.
2. Press the "Settings" button.
3. Set up scope settings.
4. Activate "Scope quick switch" slot.

This allows you to switfly switch scopes during combat by using the "Scope Switch" button.
You may also unequip your scope by retapping the scope you have attached.

※ The "Scope Switch" button will only be activated when you have a gun and more than 2 scopes.