Optical instruments, namely telescopic gun sights for rifles, handguns, pistols and shotguns; ballistic range finders for calculating bullet drop; telescopic riflescopes; spotting scopes; range finding binoculars; optical rangefinders; laser rangefinders; prism sights, reflex sights, red-dot sights, and smart reflex sights all being telescopic gun sights; optical zoom multipliers; bore sighters for firearms; binoculars and monoculars