Set up a target at 21'. Aim the pistol at the target and adjust the laser to the top of your sights. You want your sights and the laser to be pointing to the same spot. The laser and the sights will only coincide at one distance. If your sights are on the laser will be on.
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"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.