Laser rifle sights, they are visible green laser sights or red laser sights , invisible IR infrared laser. These IR lasers for weapons can be mounted onto your rifles easily, with the invisible IR target dot, you can see it with many kinds of night vision scopes.
Red is the most prevalent color and has been around longer. But green is more visible in daylight/well lit situations. Both work well at night. These gunsights are especially useful for long distance shooting.
