Disclosed is a gun rack structure that ensures the secure fixation of rifles and long-barreled weapons. More specifically the gun rack is applicable to weapons that are ready to be used at any time, and ensures that they are kept securely by fixing it to a certain place indoors or inside a vehicle. Thanks to the adjustable structure of the gun rack, it can be adapted to different fore-end and barrel structures, after the weapon is placed, it is activated with one move that provides to fix the fore-end or barrel and likewise it is inactivated with one move that provides to disengage the fore-end or barrel. The disclosed gun rack and gun holder assembly give military personnel the practicality they need.