Barrett Optical Ranging System

With the aid of the BORS, marksmen can rapidly account for temperature, barometric pressure and aiming at an upward or downward angle.

Barrett states that the BORS "instantly takes care of the data work so the shooter can focus on the task of putting lead on target."

It takes data from thousands of tables and accounts for a number of real-time external factors automatically giving the shooter the exact yardage at which a bullet will hit its target.

It also includes a cable that allows users to program custom loads on their computer and transfer them directly to the BORS.

[1] While designed to withstand military operations, the BORS is also available for civilian sale and can be used by long-range marksmen including target shooters and hunters.

The BORS mounted atop a Leupold Mark 4 M1.