HordesOfKailas
Still learning
Without sharing his general enthusiasm for them , I would take Smokey's one concept a step farther.
Align a laser parallel to the bore on purpose. Ie if the laser has a 1in offset as mounted on the gun, have a 1in offset in the impact, so that you have consistant impact at any vaguely practical distance you'd use it.
By the distance that bullet drop bcomes significant factor, that's farther than you'd use the laser.
I have a laser on my parents' Hi-Point 9mm carbine for that exact purpose. They aren't marksmen or highly polished like many of us here, so this is a great way to help them get on target quickly. At HD distances, bullet drop is non-existent and the rail is on the barrel itself. Makes it literally a "point and click" interface.
I do however think that practice and weapon familiarity beats a laser. I practice with all guns that would likely be used in a SD scenario and a laser doesn't do much for me. At the distances it might be handy, the shots are easy. At any distances beyond that, it's probably too faint to be seen.