I've used a Bushnell optical boresighter for many years with perfect satisfaction. The adjustable arbors provide a perfect fit in any bore and as long as the crown is in reasonably good condition it'll work just fine... I've not used the lasers but don't see why they would not work.. I wonder how they overcome the tolerances in different rifle. If there is less than a perfect fit the spot will change positions, not a good thing.. Still I've no real time experience so can't really comment. the optical onew ones work great..