2 Handgun Hangers Under Shelf Handgun Storage. Clear off the shelf space in your safe and expand the capacity with Handgun Hangers. Handgun Hangers are a one-gun pistol hanger that will slide under any standard, ¨half inch - three quarter inch" thick shelf. They are powder coated steel with rubber ends so they will not damage guns. Handgun Hangers fit as small as a 22 caliber gun and are made to slip in anywhere there is a little extra space.