The Axeon Absolute Zero is designed to expedite sight-in time on the range with scoped firearms. Housed in metal, the sighting accessory easily affixes to optics by way of a ring system adaptable from 1" to 30 mm. The system utilizes two lasers that emit beams downrange, and when used in conjunction with the provided sight-in reflective target, users should be on target in three shots or less. Price: $85. axeonoptics.com.