Buy a safe, bolt it to the floor and don't give her the combo.
Then buy guns.
If she says she wants to leave thats up to her.
+1 - that's pretty much what worked for me.
That and the wife knowing that she could piss and moan about me doing something - and I was pretty much going to do it anyway.
I realize that not everybody is the same - but my "significant other" started out NOT wanting guns in the house - but also not being really adamant about it. I took the training course - got my license - and she knew all about it. Once I got my license - she said " so I guess this means you are going to buy a gun now" - I was thinking " she thinks I am only buying one he he".
The first pistol I bought - she did not know about. The second one I bought - I Walther P22 - I bought while she was there in the store with me (Four Seasons) on a Saturday - while the store was it's usual packed self - and there were a couple of women buying guns. I think this actually helped as she saw that gun store was not full of a bunch of rednecks and Nazis wanna be's and there were women in there too. It was also a P22 - which I excused away by saying it was a good training pistol - and it would be kept in the safe all the time (which it was). I also took her shooting with it a couple of months later - and she did ok.
Another thing that helped was that she went thru a phase where she would do this thing when we met up with friends where she would say " you know what Calsdad's latest hobby is? - he bought a gun!" . The reason why this helped is that EVERY single time she did this , the person(s) we were talking to would say " Cool! I always wanted to shoot a gun" - or - "My father used to take me shooting when I was a kid" or something that effect.
This happened multiple times - and I actually ended up taking some of HER friends shooting. She stopped doing that - and HER friends actually helped argue the gun case for me a few times.
The other thing that happened is a few different crime incidents. One was a home invasion just down the street from us where the perp broke into a house in the middle of the night and tried to rape a teenage girl - the father and mother struggled with him and received knife wounds in the struggle. I used this as an opportunity to point out that neither would have received knife wounds if they had a pistol and had just shot the guy. I also pointed out that they could have ALL been killed if the perp had gotten over on them. The SO responded with " but the guns are locked up in the safe - what good does that do us". Exactly - I said, this is why a pistol has to be kept in a quick access safe - and you have to be trained to use it properly so you know what to do in a case like this.
But all my guns stayed locked up in the safe - down in the basement, because honestly I myself am just not that worried about home invasion (in the example above the perp followed a teenage girl home - and got in because the house was unlocked).
The second incident just happened a few months back . A friend of hers had two men in ski masks walking down her driveway in the middle of the night (they set off a driveway alarm). When the friends put all the lights in the house on - the two suspects bolted and took off. This really freaked out the SO - because she realized that this kind of thing REALLY DOES HAPPEN. I augmented her fears by asking her what does she think would happen if two guys got into the house - KNOWING that there were people home - what does she really think a perp like that is going to do anyway, it won't be toasting marshmallows and singing kumbaya.
So the SO's response at this point was to actually suggest we should have a pistol ready in one of those quick access safes in case something happened. To which I replied: " well that's good for me - but what are you going to do?". She asked if the safe only allows one person to access it - I said no you can get combination or biometric safes and the biometrics allow multiple users. I told her that even though
I have a license - in MA that does not allow HER to use the pistol, even to defend herself. So if I am not there - and somebody breaks in and is threatening her - legally speaking she cannot pull that pistol out and shoot the guy, because in the wonderful state of MA - she will probably get
ME arrested for not securing my weapons.
Lightbulbs go off - female ponders reality - I suggest getting her license. This is something we are still working on.
The other side story is that I have bought a number (large number) of guns over the last few years. And the economic situation has made these into halfway decent purchases. I do not hesitate to point out that the vast percentage of my gun and ammo purchases were actually good investments - at a time when the stock market and 401k's were going down the crapper. Since the SO is very money conscious - this helps to sell it.
The bottom line is that me owning guns has not drastically altered her life - being exposed to them personally HAS changed her attitude in a way that not being exposed to them and arguing the point existentially would not have done.
If it was me I would CAREFULLY pursue the gun hobby anyway. Get the license - take the training class with friends so you can pass it off as something you did with the guys. Get your license - unless your wife/girlfriend monitors your EVERY move you should be able to do this without her even knowing. If you want to buy a pistol or rifle - do it and just put it somewhere she will not see it. Yeah - this is lying and sneaking around - but there WILL come a time when something will happen and you will be able to break it to her. Like I said above: everybody is different and her finding out may get you a restraining order and divorce - or it may get you being a gun owner finally accepted. In the end that is up to you and how you handle the situation.