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The Osprey Universal Laser Boresight is the most complete, accurate, easy and inexpensive way to accurately boresight your weapon. Just slide the Laser Boresight cartridge into the caliber-specific sleeve in your rifle chamber and a laser dot is projected down the exact centerline of your barrel for extremely accurate scope or sight adjustment. Boresighters and cartridge sleeves are meticulously engineered with precision for a flawlessly centered dot every time. An invaluable tool for any gun enthusiast, this boresighting unit will save time and ammunition while allowing you to sight your weapon in areas where discharging a firearm may not be possible and takes up no more space in your pocket than a rifle cartridge. Convenient on/off switch means you don't have to have the action closed and locked to activate the laser. A durable nylon case is included with each bore sight. It is specially designed to hold your bore sight along with all the arbors you need for your firearms. Organizes any combination of arbors and boresights in a convenient case to take anywhere. Includes Includes 3 LR41 button-type battery cells. WARNING! Dry firing bore sight laser will VOID WARRANTY! WARNING! Laser may cause eye injury. Avoid looking directly into laser. Avoid shining at mirrors. DO NOT aim at any person or animal�s eyes. Treat the laser as a loaded weapon! Always remember to unload your weapon before Bore Sighting. Specifications Minimum Range for Sighting: 15 yards Maximum Range for Sighting: 100 yards Wavelength: 645nm - visible red diode laser 632nm (model .223 20X) - appears 20x brighter to naked eye Operation: on/off end cap Battery Life: 1 hour (continuously on) Power: Power Supply: (3) LR41 batteries Dot size: 1.5 @ 100 yards Instructions for Bore Sighting your weapon: The laser Bore Sight is factory aligned for simple installation. First place the batteries into the Bore Sight housing replace the end cap turning to the right until the end cap lightly seats, this activates the Bore Sight laser. (AimSHOT on-off modification is to prevent damage to the laser end cap). Place the Bore Sight into the weapons chamber (always maintain laser safety rules), using the correct arbor for the caliber to be sighted. Slowly close the bolt (it may not be necessary to have the bolt closed if the bore sight fits snug in the chamber). Measure 25 yards, you may use a vice or gun rest to assist in holding your weapon on target. While the laser is on the bull�s eye, you can now observe how many inches your scope or iron sights off target (the laser will put you within 1.5 to 2 inches of dead center). Due to the fact that scopes vary, you must follow instructions for your particular scope to adjust the cross hairs to the bull's eye. It is not necessary to calculate the exact number of clicks. You may simply click the reticule up or down, left or right until it is on the bull's eye. The same procedure is used for iron sights. Remove the Bore Sight after sighting your weapon (if the bore sight stick in the chamber, a cleaning rod may be used to lightly tap the sight out of the chamber) turn the Bore Sight end cap to the left turn off the laser. We recommend removing the batteries from the Bore Sight for storage. A battery discharged in your Bore Sight could possibly destroy your unit.