The NRA is often accused of being “a wing of the Republican party”.
What utter bollocks. The NRA’s political wing cares about one thing: the right to keep and bear arms.
The NRA has supported reasonably-electable candidates from any party, so long as they support the RKBA. The NRA frequently endorses Republicans and Democrats. I believe they’ve also endorsed several third-party candidates over the years.
The fact that the NRA often endorses more Republicans than Democrats reflects more on the anti-gun position of many Democrats rather than the purported right-wing leanings of the NRA.