Good question, Bill. There might well be, well worth researching- similar perhaps to the "spot-shot" lites touted for use in indoor practice for "Move-Mount-Shoot" drills I would guess. A neighbor, retired State Trooper, told me he had emptied his Glock, when another bad guy entered in the fight, and Al bluffed him, somehow making the perp back down and drop his knife-- I asked him if he had stopped to buy a lottery ticket afterwards-RWTF

"The field is the touchstone of the man"..