I've been thinking about a Quick Access Safe for Home Defense for my shotgun a Mossberg 12GA. 500 Mariner. Now so far as securing the Shotgun I've been looking at some Security Cabinets from Stack-On they have a key mechanism aswell as there line of safes they have, particularly there total defense line which is operated by a electronic mechanism, I would be securing the safe & or cabinet in my walk in closet. Now in the event there was ever a home invasion I would want to be able to access the safe/cabinet as fast as possible & I'm curious to know which would be less time consuming to open as every second counts in such a situation. what are you're thoughts on this matter?