

For some weapons, bullet holes appear larger while using FMJ. This makes them easily visible so others can tell whether or not an enemy player has the FMJ attachment, while also changing the sound of the bullet impact. If a player fires a weapon with the FMJ attachment, the bullets will be red tracers and a small rain of sparks will shoot from the bullets' impact point. Getting 40 bullet penetration kills with the FMJ unlocks Extended Magazines for that primary weapon. Instead, it allows the bullets to penetrate thicker surfaces, as well as losing less damage through other materials.


It does normal damage against enemies in the open, though the in-game stats show an increase in damage. FMJ is the replacement to the perk Deep Impact from Call of Duty 4: Modern Warfare, allowing bullets to penetrate surfaces more easily.
