Help me with a gun

I'm deciding to buy a k2 or sg552 and I was wondering does the Sg552 zoom in like the Styer AUG A1 when left clicked or nothing at all?

Description of Sg522:
Manufacturer: SIG. Inc. in Switzerland.
>>Equipped with telescopes for fixed and aimed shooting <<
High power in a long ranged shooting.

From Main website.

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