Waterbug,

I have found the acquisition of double guns to be an delightfully incurable malady. I shoot them and hunt with them and it makes what I'm doing just a little more fun. I have one piece of advice. If you get to the point that your vault has magically become full and you say to yourself I need to get rid of some of these guns to make room, stop. I have the perfect solution, take a breath, head over to your local sporting goods store and buy another vault, problem solved. I can't say that this will work for you but it sure has for me. Congratulations.
Swampman