Patent attributes
Drum magazines have a housing defining an ammunition passage having an outlet, a first spring mechanism adapted to bias ammunition in the passage toward the outlet, and a follower element in the passage, the follower element including a second spring mechanism adapted to generate a biasing force against a passage surface portion, such that the follower resists movement within the passage in the absence of a deliberately applied force. The magazine may be a drum magazine, and the passage may have a spiral shape. The first spring mechanism may include a control adapted to selectably change the first spring mechanism from a biasing condition in which force is applied to the follower element for motivating ammunition toward the outlet, and a loading condition in which the first spring mechanism is restrained to facilitate loading of the magazine in the absence of a biasing force.
