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I come up with 12 please read the following That is a good question the Internal dimensions are 17.5" tall X 13" wide X 13.5" deep so you could fit 2 of these HySkore 6 Gun Modular Pistol Rack in it to safely holds 12 handguns (one rack per shelf) racks are Material Foam Height 6 Inches Length 7.5 Inches Width 11.25 Inches https://www.midwayusa.com/product/537283/hyskore-6-gun-modular-pistol-rack-closed-cell-high-density-foam-black
This is only a dual shelf Pistol Vault. If you are just planing to stack pistols, then it will hold as many as space allows depending on their size and shape. looking at a picture of the interior, I would say comfortably no more than 8 which would leave little to no room for much of anything else. Interior picture here : https://www.google.com/search?q=Bulldog+Digital+Pistol+Vault+17.5%22x13.5%22x13.5&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjone6K2c3ZAhXpmuAKHffICfcQ_AUICygC&biw=1920&bih=938#imgrc=uXZNIZEB59GDhM: