You obviously know little about the NRA. I'd suggest going to their site and reading.
There is no one pro-Second Amendment organization that will meet every citizen's idea of the perfect advocacy group, but just to let you know, a search engine will provide the links to greatly increase your knowledge on this subject. Search for JPFO - Jews for the Preservation of Firearms Ownership, GOA - Gun Owners of America, and others.
Go here:
National Gun Rights Organizations.