I have heard many gun aficionados brag about how fast they can get into their gun safes, even on this board. They do make safes that are hard to get into if you don’t have access, and easy if you do.
Yes, and your discounting of the massive number of guns that are sold legally into the blackmarket is odd, but I would up the requirements for ownership of some guns as well.
A good gun control policy means that law abiding responsible gun owners have a bit more red tape to get through, and irresponsible or criminal people have a very hard time getting them.
Currently, in order to prevent gun owners any inconvenience at all, we instead make nearly all guns available to everyone, no matter how irresponsible or criminal.