The Laser Sight is available to all weapon classes in Call of Duty: Black Ops II, excluding launchers and special weapons.
Laser Sight increases the hip fire accuracy of the player's weapon, essentially replacing the Steady Aim perk from previous Call of Duty games. When attached to a weapon, it emits a beam of light pointing where the weapon is facing, tightening the hip fire crosshairs and thus increasing the weapons hip fire accuracy by reducing the bullet spread. Contrary to widespread belief, the rounds do not land exactly where the laser points. The laser, which emits from the gun, can only be seen by the player using it and not the enemies, and the beam of light becomes completely invisible when the player aims down the sights of the weapon.
It affects each weapon class differently. Submachine Guns benefit the least from this attachment, whereas the Shotguns benefit the most, with Sniper Rifles, Light Machine Guns, and Pistols in between. It grants roughly a 50-70% accuracy increase over all weapon classes. There is little disadvantage to this attachment; unlike some which increases recoil, this attachment is only beneficial to the weapon, unless the player wants a larger hip fire area in order to hit more often when not directly looking at the enemy.
A Laser Sight mounted on a MP7 (Note the rail cover on the left side of the gun has been taken off even though it isn't in use).
Turning on the Laser Sight on the Chicom CQB. It should be noted that turning on the Laser Sights replaces the cocking animation at the start of a multiplayer match.
The Laser Sight returns in Call of Duty: Ghosts, and it is only integral to the ARX-160, the Chain SAW, and the MAAWS. The MAAWS is fitted with a laser sight in both campaign and multiplayer, whereas the ARX-160 and the Chain SAW are only equipped with one in multiplayer. This attachment has the same effect on the ARX-160 and Chain SAW as from Black Ops II: It reduces the radius of the hipfire circle, thus making hipfire accuracy a lot better. One the MAAWS however, it is used to laze targets for the rocket(s). It is possible to pair this attachment with steady aim, leading to amazing hipfire accuracy.
Call of Duty: Black Ops II
If used on Sniper Rifles (except those with an ACOG scope), when the player aims down the sights, the laser beam will disappear. The Laser Sight shares this trait with the "cg_laserForceOn 1" console command from earlier games; this is because the weapon model disappears while in a scoped view (scope layer).
In the campaign, the player can seldom find a weapon with Laser Sight and Dual Band Scope despite this combination is impossible when customizing the loadout.
When affected by the EMP, the laser sight will turn off, like any other electronics, but the steady aim effect will still be present.
When a laser sight and an under-barrel attachment are equipped on a weapon, the normal pick-up animation will play, but at a faster rate.
The laser beam is visible when the game is played in 3D - the option available in the settings via the in-game menu.