"The Laser Sight adds a visible laser aiming dot to the weapon which increases accuracy from the hip. The Laser Sight can dazzle enemies when turned on, but also reveals your position."
90 Kills (Assault Rifles)
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The Laser Sight is a secondary weapon attachment in Battlefield 3. When attached to a weapon, it slightly improves weapon accuracy while hip-firing. Additionally, it can be used to blind targets when aiming at them, however it tends to reveal your position. This can be countered by turning the laser off using thekey, at a cost to hipfire accuracy.
When equipped on the weapon the laser sight for the US side appears to be on the right hand side of the weapon very close to the barrel whereas on the RU side the laser sight is attached on the left hand side of the weapon closer to the scope/iron sights of the weapon as can be seen in the picture. The Laser Sight is also default attachment for the G17 (normal and suppressed). The P90 and PDW-R have a cosmetically different model for their attached laser sight, a tube connected by cable to a power supply.
PC players have the ability to keybind to the same key used for , allowing the laser to be turned off while aiming down sight.