My God man! Suck it up! Have you lost your mind letting her dictate what you can and cannot have?
If the normal paths of lies and cheating are not working to get the guns you 'need,' then you need to put your manly foot down and let her know who wears the pants and carries the big wallet in the house and do what I do with my wife. Bribe her!
Yes, it is better than admitting defeat and better than asking permission. A bride says that you care about her well being and happiness without being a henpecked pansy. A bribe also buys her silence because she knows the bribes will stop when the gun buying stops.
In this manner, both you and your wife can be happy, maintain your respective integrities, have the things you want, and rest assured knowing that bribery has been the lubrication of spousal relationships for thousands of years.
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Maybe before trying the bribes, have you tried the tactic of buying guns that are "her" guns? A friend of mine has a whole set of tools in his garage that he freely admits are tools he bought for his wife that she doesn't use. Just a thought. You get away with the gun purchase without buying the item for youself. Be wary, if your wife is sober, she may see through your thinly veiled plan of buying guns for her.