Well, I'm a young'un here, and don't have a lot to contribute to an "old guys" thread, but I'll show what I've got now.
My 16 inch 870 stays between the front seats, with this long gun in the trunk. The other two stay on my person.
I know the light and red dot sight aren't "old guy" tech, but they are worth their weight in gold, when I'm working. The other guys in my agency, for the most part, will be going to the range in a few weeks wito qualify with the best technology the 1960s have to offer, with iron-sighted M16A1s. I'm not complaining, because it's a long step up from nothing at all, and it's the best they are going to get. I was willing (and able) to provide my own, so this is what I work with.