Everybody knows that this topic is my pet hate but this time I have a story
I know of a guy on the key's as it happens who tried this. After first trials he found that his Riffe actually hit more or less the spot of the pointer for a few shots before the thing skewed on his gun through the jerk of recoil. So after a reasonably successful target shooting session he proceeds to cut lumps out of his gun to hold the laser and stop it moving around. The result of this was that the laser stayed put and after setting up he could hit the mark of his target every time (I have to say that I was surprised by that). But! It turned out that when he actually went spearfishing that the laser spooked more fish than those who were comfortable or curious about the spot of light. The end result was a perfectly good Riffe gun with a whopping big lump taken out of the front and a laser pointer that was useless. Moral of the story, learn to shoot your gun properly!