Pretty simple, in Arma 3 there are already animations for mounting and demounting scope and silencer, even though they are not used.

It would be great if you could add these options for Argo on a keybind.

Some scopes, e.g. the MRCO / MOS are pretty bad at close range, deamounting them in game would be great.
You probably wont use this very often, so this request has low priority and was just an idea that would be easy and nice to Implement.