Breaching Charge

A breaching charge is an explosive designed for gaining entrance through locked doors.

Call of Duty 4: Modern Warfare
In Call of Duty: Modern Warfare 2 a breaching charge is seen on multiple levels, though it is not usable by the player. It is used by Lt. Vasquez in "Charlie Don't Surf", and Cpt. Price in "Ultimatum". It is a small explosive attached to the handle of a door to blow the lock.

Call of Duty: Modern Warfare 2
In Call of Duty: Modern Warfare 2, the breaching charge is used much more extensively. It is seen on multiple Campaign and SpecOps levels. When the breaching charge is used, time moves in slow motion. In addition, your magazine will be loaded to full capacity, no matter how many rounds are in the magazine. In this game it is a shaped directional charge taped to a piece of Styrofoam, which is stuck to a door or wall to completely blow the entrance.