A transport system for an at least partially complete cartridge has: at least one piece of movable equipment provided with at least one seat designed to contain the cartridge and delimited by a first wall and by a second wall beside and opposite one another; a conveyor to move the movable equipment along a path; and an operating device arranged along the path, outside of and independent from the movable equipment. The first wall is mounted on the movable equipment and movable closer to and away from the second wall between a holding position, in which there is a minimum distance between the first and second walls and a release position, in which there is a maximum distance between the first and second walls. An elastic element that pushes the first wall towards the holding position, and a control appendage moves the first wall towards the release position.