That's really cool! I've got a mini Laserlyte which I sight my pistols and rough-in my rifles with. I had no idea there was a shot-pattern version. I'm gonna put that on my radar, as I've got another Holosun red dot on the way, which will find a home on my 590. I know it probably doesn't need it 90% of the time but I do shoot slugs now and then and it's not adding any weight in the grand scheme of things. One thing I've wondered from time to time - My bore sight, itself, has adjustment screws. How would one calibrate it? A "laser bore sighter sighter" perhaps? ...or is that just for factory use? No mention in the manual.