The invention relates to a device for feeding ball-like ammunition, so-called paint balls, into the projectile chamber of a sporting arm. The magazine is arranged separately from the arm and is connected to same by a feeder tube. A feeder driven by a motor feeds the balls from the ball container into the feeder tube. Traction from the motor is transmitted via a connection or clutch which can consist of a flexible member and a transmission element. Protrusions are arranged on both the flexible member and the transmission element, which come to bear on each other for transmitting traction. The protrusions are at least partially flexible, so that the transmitted force is limited. This way, explosion of the balls from excessive pressure is prevented. In addition, the feeder is detachably connected to the drive element by means of a bayonet-like connection to facilitate the cleaning of the ball container.