This scope is described as:

A red dot sight plus scope. Toggle the scope while aiming.

It’s located in south-west Media Luna province in the small town of Acevedo. A Rebel Radio side mission is nearby. The accessory case is upstairs in a sicario house. This is the only cartel presence in the town, and there are three sicarios present. Easy pickings.

This scope is the same spec as the Micro T-1 & G33, however this is only for ARs and the RUS Red Dot provides a different reticle.

It lets you switch between 1x and 3x zoom levels for near and far targets, but at the sacrifice of some visibility. While it is useful for versatility on an AR, I like a PK-AS for accuracy at longer ranges, found in Itacua.