-Basics:
Type        : Laser sight
Usage       : Increases accuracy on many weapons.

-Tactical/Comments: 
The laser sight makes your weapons more accurate. The red dot is merely cosmetic, so do not use it to aim.  Not all weapons can be equipped with a laser sight. 
-As seen in:
Leon, The Terminator(possibly the first ever movie use), Leathal Weapon 4, etc. 