They probably work, but I don't think they are necessary. I removed most of the "gun racks" inside my safe other than a divider down the middle. I can put about twice as many guns in there as it was designed for by doing so. I alternate guns from one side to another and leave the bolt open on bolt action rifles. Some people will alternate muzzle up and muzzle down to squeeze in even more. The only downside is that everything has to come out to get to one in the back of the safe.