Abstract: An ammunition feeding system includes an endless, ladder-type conveyor trained throughout the interior of a magazine in a serpentine formation consisting of a plurality of straight line sections and interconnecting turnaround sections. The conveyor includes a succession of carriers which are adapted to assume a closed, ammunition round retention condition while in the straight line sections and to automatically open while in the turnaround sections to effect round handoffs to any transfer station located thereat for live round-spent round exchanges with respect to the carriers as they transit the turnaround section. Guides are positioned at the other turnaround sections to preclude round handoffs by the opened carriers.