A dismantling system for separating ammunition cartridges comprising a casing, a bullet, powder and a primer the system comprising: an extraction head for extracting the bullet from the casing, motor means suitable for moving the extraction head in a direction to bring it closer to and further from the extraction position of the casing, and retaining means for retaining the casing in an extraction position while extracting the bullet, the retaining means comprising: an upper support, suitable for resting on a widening of the cross section of the casing, preventing the casing from moving in the extraction direction of the bullet, the upper support being connected to said motor means for moving the upper support linearly in a direction to bring it closer to and further from the extraction position, wherein the system further comprises: a flywheel and a cam follower, wherein the extraction head is attached to the flywheel by means of a connecting rod eccentrically attached to the flywheel, the upper support is attached to the cam follower running through a groove of the flywheel, in a way that the upper support is in its lower position since before the extraction head comes into contact with the bullet, and starts moving upwards again after the extraction head has extracted the bullet. an extraction head for extracting the bullet from the casing, motor means suitable for moving the extraction head in a direction to bring it closer to and further from the extraction position of the casing, and retaining means for retaining the casing in an extraction position while extracting the bullet, the retaining means comprising: an upper support, suitable for resting on a widening of the cross section of the casing, preventing the casing from moving in the extraction direction of the bullet, the upper support being connected to said motor means for moving the upper support linearly in a direction to bring it closer to and further from the extraction position, an upper support, suitable for resting on a widening of the cross section of the casing, preventing the casing from moving in the extraction direction of the bullet, the upper support being connected to said motor means for moving the upper support linearly in a direction to bring it closer to and further from the extraction position, wherein the system further comprises: a flywheel and a cam follower, wherein the extraction head is attached to the flywheel by means of a connecting rod eccentrically attached to the flywheel, the upper support is attached to the cam follower running through a groove of the flywheel, in a way that the upper support is in its lower position since before the extraction head comes into contact with the bullet, and starts moving upwards again after the extraction head has extracted the bullet. a flywheel and a cam follower, wherein the extraction head is attached to the flywheel by means of a connecting rod eccentrically attached to the flywheel, the upper support is attached to the cam follower running through a groove of the flywheel, in a way that the upper support is in its lower position since before the extraction head comes into contact with the bullet, and starts moving upwards again after the extraction head has extracted the bullet.