The .223 / 5.56 Nato NcStar Laser Bore Sighter provides the quickest and cheapest method for sighting in rifles of all types. Simply chamber the laser Bore-Sight like a regular bullet and a laser dot will show exactly where the rifle is aiming. Simply adjust your sights or scope to the laser dot and you are sighted in without firing a round! Live fire is only needed to fine tune the weapon being sighted in order to compensate for inconsistencies, such as bullet drop due to distance, bore temperature, windage, and elevation. Perfect for hunters, competitive shooters and law enforcement, the NC Star Laser Bore-Sight is sure to take the frustration out of sighting in almost any gun.