Unfortunately the NRA endorsement is almost worthless nowadays. Even Dingy Harry got one although he did little to earn one.
I believe Dingy Harry only got one late in his career after he voted in support of the Federal law that protects gun manufacturers from product liability lawsuits in cases that don’t involve actual product defects.
I doubt and endorsement from the NRA is “worthless” as you say. There may only be 5 million NRA members, but studies have shown nearly 20 million others support NRA goals. Republicans down to State level always complete NRA questionnaires sent to them just prior to elections. Even those with long standing ties to NRA. If NRA was “worthless” why would they even bother?