Sighting in your firearm is twice as fast with the AxeonTM Absolute ZeroTM Sight In Device. Spend your valuable time and money at the range practicing your skills instead of sighting in your rifle. It's never been easier... simply slip the Absolute Zero onto the end of your barrel and place your rifle on a shooting bench or vise. Turn the laser on and align the twin beam with the reflective target 25 yards away and fire a single shot. Then using the location of your shot and the laser beams, adjust your scope to Absolute Zero accuracy. Then, fire a test shot at 100 yards and you are ready in less time and with less ammo wasted.