Abstract: A storage locker for storing firearms of different sizes is disclosed. The storage locker consists of a housing having a back wall, side walls, a top, a bottom and an open front defining an interior. An inner door is pivotally attached to the housing and pivotally movable between an open position and a closed position wherein the inner door closes off the open front. The locker has a lock for locking the inner door in its closed position. The locker has a mounting wall attached to the housing inside the interior, the mounting wall having a plurality of first apertures evenly spaced along a front face of the mounting wall. The locker also has a plurality of firearm mounting racks, each rack having a mounting member with tab portions for mounting to the mounting wall by hanging the tabs on the apertures.