WordNet sense 1 (a business firm that publishes magazines):

magazine publisher

WordNet sense 2 (a periodic publication containing pictures and stories and articles of interest to those who purchase it or subscribe to it):

mag

WordNet sense 3 (a light-tight supply chamber holding the film and supplying it for exposure as required):

cartridge

WordNet sense 4 (a storehouse (as a compartment on a warship) where weapons and ammunition are stored):

powder magazine, powder store

WordNet sense 5 (a metal frame or container holding cartridges; can be inserted into an automatic gun):

clip, cartridge holder, cartridge clip