A method enabling a long gun to be stored upright in a cabinet having a floor and an overhanging surface. The apparatus has: (a) a rod having a thickness less than the inside diameter of the gun barrel and having a length greater than the difference between the height of the surface and the length of the gun, the rod being inserted into the gun barrel; (b) a cap attached to one end of the rod, the cap having a diameter greater than the inside diameter of the gun barrel, the cap limiting the insertion of the rod into the gun barrel; and (c) removably attaching the cap to the underside of the overhanging surface via a magnet or hook-and-loop material.