I'd say spare mag just because of the overall size of a mag compared to another gun. what kind of gun are you talking about for a pocket gun? a 38 special? if you think you'll feel better having 2 guns ready to go at the same time do that up. I just know for me personally I'd just need the 1 gun and the mag its in for normal use. Now if we are talking the end of days and civilization is tumbling down, then I'm stopping by Dillion Percision and I'm mounting a gatling gun on top of my accord.