Pre-combat checks (PCC) are some of the most important, yet neglected fundamentals of being combat effective. When you bring your rifle to a fight and there is nothing to aim with, who is going to foot the bill? This goes for lights, lasers, NODS, thermals and all the other cool guy gadgets that takes some level of consumable or require a zero. The ZERO-R slaps are a way to help bring your attention to the mission readiness state of your equipment.
Use the Black Hills Designs ZERO-R as a quick way to verify the last time you performed a zero, verified batteries, serviced the weapon or any other number of sensitive maintenance tasks.