I'm known as a gun guy, I guess, at least among the other gun guys. A couple of people where I work now ever used to work for the NRA, just down the road from here. Only they really aren't gun people. They're hunters. The problem with labels is that they tend to narrowly define something, especially people. So "gun guy" is pretty broad, actually, and the closest thing I can think of the old term, "gun nut" from as far back as the 1960's, before there were survivalists, snipers, militias, mass murderers, blue and red states, and shout radio. But there was paranoia.
It is a good thing if people at work, the ones you see all the time anyway, know what your interests are. It probably isn't a good thing if you are doing things that are embarassing or illegal or in the closet. Most (but not all) people can be surprisingly accepting of a lot of things provided they don't belong to a group that tries to tell them what to think. The trick, of course, is somehow letting people know about those things without causing a problem and being casual about it. Like the anti-gun person who might want to learn to shoot, someone might even be interested.
I still have a few secrets left, though.