Abstract: A magazine for a firearm includes at least one tubular member for receiving a plurality of cartridges. The tubular member is displaceably mountable on the firearm to permit displacement between an inoperative position for receiving fresh cartridges and an operative position for dispensing cartridges from the tubular member into a barrel of the firearm. A gate member is pivotally mounted at an open end of the tubular member and has a protuberance in the path of an end cartridge to inhibit ejection of the cartridge from the tubular member. The gate member co-operates with a loading mechanism of the firearm and is operable to displace the gate member out of such path.