How to make a dual render scope for my thirdperson gunsystem

So i am devlooping a third person gun system and i am trying to make a scope mode to the system. i have tried using dual render scope from boatbomber.

But i have no idea how i would use it for differnt types of tools.

I would like if the dual render displayed on a surface gui on the gun scope.

So i could use camera manupulation to zoom into the scope.
But i have not idea how to start.

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