Do you know how the NRA grades and rates politicians? Because you clearly seem like you do not.
Let me break down what the NRA does. They assign letter grades to every congressman and woman. They will put a scale of what % of times they vote with the NRA position interest. They are very clear about what will and will not happen. If a politician votes against them one time, but otherwise has a 95% A rating then they will get an endorsement, and likely campaign contributions if they are in a contested race.
A politician with a C rating is likely going to see a primary challenger funded. In fact they make it clear that if you do not vote with them some minimum threshold, this is exactly what they will do.
So they are prett clear and specific about how they operate here. And on important (to them) bills they will put out a message with their stated and preferred position.
They then publish this position in their magazines. Every year in the month before voting, in their October edition of American Hunter for example, they publish a voting guide by district. And they will occasionally do so for primary season. So they send out this position and a list of bills they did not support to their members. So, please, the NRA is explicitly telling them ‘vote with us, or else’.