My aging eyes have left me no alternative other than to add lasers or light/laser combos to my pistols used for carry purposes. After many rounds down range to zero the laser, I bought a 9mm bore sight red dot laser to better align the laser with the bore sight red dot. However, it only works for horizontal alignment not vertical because the pistol barrel tilts up a bit with the bore sight laser in. The slide does not close all the way and the instructions clearly say not to close the slide 100% so as to not damage the bore sight. So the rail mounted laser is low at least 6 inches and obviously the farther out the range the wider the gap. Has anyone used this method to zero their lasers? Any comments or suggestions? ps - I'm using one that fits inside the bore, not inserted at the muzzle end.