The Barrett Optical Ranging System (BORS) is an exciting new innovation in long range shooting. The integrated electronic ballistic computer couples directly to the Schmidt Bender PMII 5-25x56 riflescopes acting as the upper rear scope ring. The Barrett BORS measures air temperature, barometric pressure, and bore line angle. The BORS also calculates a ballistic solution for a specific user-selected cartridge eliminating the need for “counting clicks”, calculating mil dots as target ranges change, or using a handheld computer. The BORS allows the shooter to focus on environmental conditions, assess the tactical situation, and quickly engage multiple targets at varying ranges. The BORS simply takes the mystery out of bullet drop.