Abstract: A system for enabling one-handed loading of an ammunition magazine into an automatic pistol includes a flat support having a stop member at one end and a cover positioned over a portion of the support for attaching the support to a user's belt. A spring-loaded hinge biased toward an open position is connected to the support adjacent to the stop member for limiting movement of the hinge. A magazine holder is removably connected to the hinge for removably receiving and holding an ammunition magazine for an automatic pistol. A cover strap is attached to the cover for facilitating convenient carrying of the ammunition magazine when the cover strap is fastened in place. Release of the cover strap causes movement of the hinge by the spring to position the magazine in a position for facilitating one-handed loading of the magazine into an automatic pistol by the user. The magazine holder can be connected to the hinge for facilitating use by a right-handed or left-handed user.