FTFY I wouldnt say gauranteed either, as long as four rules are followed. An example of a accidental discharge would be a design flaw/broken part that causes firearm to discharge. A recent documented case would be the Mossberg 500, if it has a older firing pin spring and say dropped on muzzle...
This, I have a "sink" size base cabinet with wood laminate top it was used as a microwave stand. Dont need it now, if you want to drive down south it's yours free.