I’ve been a NRA member now for something like 20 years. Personally, I believe anyone that owns a firearm should also be a member of the NRA. But you’d be surprised at how many are not, and there’s probably many on the this forum that are not.
On a side note, I own and race motorcycles. I think everyone that throws their leg over a motorcycle should belong to the AMA (American Motorcyclists Association). But you would be surprised how many are not. Two years ago I ran for the AMA Board of Directors. I needed 250 signatures on a petition to be placed on a ballot. I figured there would be no better place to get signatures then at a professional race. 10,000 spectators, so I should have no problems getting 250 people to sign. I worked for two hours and only found 10 people that were AMA members. I know I asked at least 100 people. I got discouraged and gave up that day.
So if only 10% of people present at an event are members of the organization that holds the event, I’d be willing to bet that not many more then 10% of the regular posters here are members of the NRA. Many people own firearms, but few are willing to help fight for the rights to own them. How many firearms owners are there in the USA? 60 million? How many are NRA members? 3 million, maybe?