Indeed, propaganda is used quite extensively by the military industrial complex to encourage continued sale of arms, to encourage external wars, to encourage fear on the notion of losing the right to buy arms, which in itself increases the sale of arms, etc and so on.
Bills are being worked on to implement expansion of laws to prevent felons, mentally disturbed, and non-citizens from purchasing and possessing firearms. And somehow, quite effectively, the military industrial complex has suckered people into a frenzy about potentially losing their rights. Increasingly interesting is the realization that 74% of NRA members agree that background checks should be expanded, and yet the seat holders of NRA, who are paid quite handsomely by weapons producers, continue to rage against it and have gone so far as to threaten Congressmen with campaign finance blacklisting.
I.e., NRA isn't representing their members, they're representing the U.S. military industrial complex, which wields 43% of all financial transactions in the world.
So really, who do you think is posing the propaganda?