NRA and Sierra Club Member: A Libertarian Answer or Common Sense?

It seems as if many people would not think an individual would be a member of these two organizations since the NRA is associated with the Right and the Sierra Club the Left. But to me it makes sense that one who is an outdoorsman would support the 2nd Amendment and conservation efforts. I don’t see myself as necessarily being libertarian, but when I have talked to a couple folks about this they think it sounds libertarian or “Joe Roganish”. Thoughts?