Should you have a bullet compensator range (BDC)? Maybe not.
Chosen, it can be a dream of hunters, offering the potential of a thorough shot of 200 yards with a rifle observed at the level 100. Sounding as specialized optical, this is a typical range in terms of lenses and tubes. The difference may not be obvious when you look inside. The compensator refers to Mil-Dots or Hash on the grid, which I always knew as sights.