Abstract: A rapid-fire weapon system having an associated magazine for storing individual rounds and a carrier system for transferring rounds from the magazine to the firing chamber of the weapon is provided with intermediate correlating means for matching the output rate of the magazine with the input rate of the weapon. In the preferred embodiment, the correlating means includes a housing having a movable part and a stationary part. The carrier system from the magazine is operatively connected to the stationary housing part. The movable housing part is rotatable with the weapon in an azimuth plane. The correlating means has storage means associated with it and differential means for meeting the demand rate of the weapon, which corresponds to the output rate of the device, with any output rate from the magazine, which corresponds to the input rate for the device.