True, the lists are not the same, but I think (based on limited research I just did) that it's reasonable to say most gun owners are NRA members.
I'm a gun owner and strongly anti-NRA. I support strong background checks, gun restrictions (caliber, rate of fire, and magazine capacity), and closing the private sales loophole (iow, requiring background checks in all situations). I do not advocate hunting except in certain circumstances (and I don't eat meat anymore which is part of that) or teaching children to shoot. Teenagers start to become old enough and responsible enough for that.
The NRA tends to think of guns as the solution to a lot of problems, which means now you have new problems. I also do not share the thinking that our guns would be sufficient to fight off the government. "Well-regulated" is very important to me.
My other responses on this thread give a couple of NRA policy examples... making a home shooting range for children as well as trying to arm schoolteachers. Both would be funny if The Onion wrote them. The fact that Americans really want these things is frightening.