Your Browser is OutdatedJust to be sure, there's no reason you couldn't use this to sight in your scope or red-dot is there? — 2 Answers
The Mantis Blackbeard the Auto-Resetting Trigger System could be used to assist in Bore sighting your optics, however, the laser will only activate when the trigger is pulled leaving the laser visible for only a split second. This would make it more difficult to boresight your optics. I would just recommend using a laser training cartridge to boresight, and this trigger system for training.
https://www.opticsplanet.com/laserlyte-laser-trainer-cartridge-223-lt-223.html
It isn’t a bore sight laser but in principle, you could turn it to always on and adjust your optic to the laser. Depending on your optic height over bore, the point of aim and point of impact will not always be the same though. So if you zero the optic to the laser from the bore at 40 feet, starting at point blank, you will hit low and you will hit less low until you get to 40 feet. All guns with sights (iron or glass) work this way.
With a flip up front sight, at 40 feet-ish the laser from the mantis is at the top of the front post. At 20 feet, you can’t see the laser because it is low and the front sight blocks your view.
With a dot optic, the dots will merge at around 40 feet and the MantisX or bore laser or bullet holes will start becoming lower the closer you get.