Just slide this unit into the chamber of your unloaded rifle and close the breech. The laser activates automatically and shoots a beam onto the target; then simply adjust the crosshairs to coincide with the beam. Handy on the range and for rechecking zero after a long trip. The unit itself fits a .223 chamber, and by sliding it into additional sleeves (sold separately for $20), it can be used in most popular calibers. $60.
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