AN/PEQ-2A

The Insight Tech-Gear AN/PEQ-2A is a Picatinny rail-mounted infrared laser emitter. It is only visible with the use of night vision devices and can be used either for precise aiming or as a handheld pointer.

In game
In Call of Duty 4: Modern Warfare, the AN/PEQ-2A is used exclusively during the single-player campaign. It is mounted on all M4A1 Carbines regardless of whether the player has night vision goggles.

It may be noted as a flaw on Infinity Ward's part that the beam itself is emitted from the muzzle of the weapon on the M4A1 Grenadier and SOPMOD, instead of one of the AN/PEQ-2A's lenses.