Since republicans are smarter than democrats, and since NRA members tend to have above average incomes, it’s most certainly above average.
Remember: the media prefers to use college degrees as a proxy for intelligence. However, this doesn’t account for the fact that the vast majority of women take gut courses, (psychology, sociology, education), and their male peers do not go to college but instead find gainful employment.
https://www.quora.com/What-is-the-average-IQ-of-an-NRA-member