I think that because of how recoil affects point of impact, the only way to zero a laser sight on a handgun is by shooting it. I recently bought a Crimson Trace LG105 laser grip for one of my j-frames. CT says the laser comes roughly zero'd from the factory, and they were right-- it was certainly close enough to get the shots on the paper at 7 yards. FWIW when trying to zero it, I discovered that the directions seem to be arse-backwards-- for example, I had to turn the screw CW instead of CCW as stated to move the POI in the desired direction.
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