agree with pax
If you feel you have to hide anything from your wife, you were not ready to be married to her, or she to you. It may be the only thing where she isn't absolutely perfect for you, but if she hates handguns and you need to hide them, you have trust issues (among other things) that will likely poison your marriage if nothing changes, given enough time.
And it may not take all that long!
Fess up, and sit down with her to decide what is really important, making her happy?, making you happy? or finding some compromise that you both can live with. Most of the time, people who "hate" guns do so because the don't understand them, or trust themselves, or anyone else with them. If you wife doesn't trust you with a handgun (or several) ask yourself, why? Then ask her. You might get quite a different answer.
Until then, you don't have anything to build on to make a good marriage. Love and lust are what gets it started, but friendship, understanding, and trust is what keeps it going. It may not work for you, but its been working for me and my spouse for 30 years, and its the best advice I can give you.
good luck.