A mounting for an ammunition container for mounted rapid-fire weapons comprising a yoke disposed on a bracket which yoke is pivotable about a horizontal axis disposed at about the level of the upper edge of the ammunition container to be contained therein, the yoke being secured at its lowermost position by a catch means. Disclosed in the application is such a mounting in which means are provided to urge an ammunition container toward a rapid-fire weapon. Means are also provided to dispose the ammunition container precisely within the mounting, to rapidly remove any container top so as to permit the rapid feed of ammunition into the weapon. A device for insuring that the yoke bears against the ammunition is provided by which inadvertent release of the same is precluded.