A device for loading cartridges into a magazine comprising: a magazine housing; a bullet carrier comprising a cartridge support seat and a spring; and a rod that is inserted into an aperture in the bottom end of the magazine housing and through the middle of the spring. In one embodiment, the cartridge support seat comprising a viewing port and a trough that extends from the underside of the cartridge support seat and is situated adjacent to the viewing port and beneath the feed lips of the magazine housing, and the L-shaped end of the rod is inserted through the middle of the spring and onto the shelf of the trough. In an alternate embodiment, the cartridge support seat comprises a viewing port and a second aperture, and the L-shaped end of the rod is inserted through the middle of the spring, through the viewing port, and into the second aperture.