I hope you are doing well.
If the NRA wanted to end the problem, they would sue the government for civil rights violations on behalf of their members with RICO charges involving govt collaboration with anti gunners trying to deny rights under color of authority.
Imho, both the NRA and its members would lack standing. Why? Because every time 0bama, his regime and the anti gun nuts spout off, the NRA gets more members, more weapons are sold (Armalite thanks you), and more ammo is sold.
No harm, no foul.
5.56mm
Well everyone lacks standing when a lib wants something but the counter is that govt indeed passed laws restricting gun ownership, type, capacity and so forth so harm has occurred.