An ammunition storage and a magazine loading/unloading device for weapons. The apparatus provides for the rapid loading of ammunition into a magazine used for holding a number of rounds of ammunition. It is comprised of a loader body having a reservoir section, having a magwell section, and a connecting way to receive an ammunition magazine, and having a manner for connecting the magwell section to the reservoir section; an essentially rectangular block which slidably interfaces with the essentially rectangular inner space of the loader body and the rectangular block with an aperture for receiving a plunger handle; and a spring retaining clip to hold the ammunition in the inner space of the loader body. The device loader body can be a single or alternatively a two piece reservoir assembly and can be used as an unloading device as well.