Point of view
Everyone has one, so let's look at a couple. "Backstabbing and dishonest" is a pretty extreme point of view, and while a case may be argued for "backstabbing" as a vaild term for what is seen as a betrayal, I don't see where "dishonest" could apply. NO laws are being broken. And morally dishonest doesn't apply either, as they are telling you up front what they are doing (or not doing) and why.
Consider the dealer/distributor/manufacturer point of view for a moment. Their main concern is not to sell us guns, but to stay in business. Their business is selling us guns, and when something artifically increases their cost or puts them at risk of liability that threatens their whole business. A decision to protect their business as a whole by losing a small percentage of sales is not unreasonable. To them, New York, California, Mass., New Jersey, etc., any state which has restrictions that make them more trouble than they are worth, those states have taken themselves out of the market.
Not selling to the state agencies sends a message (and a good one) but it is not one the states care to heed. State govts just don't care if one maker or distributor doesn't do business with them, as long as others do.
Sadly, it is the private citizens who suffer decause of this situation, and that is the whole point. From both sides.
States with restrictive laws want gun owners to suffer. They want to discourage ownership. They would be quite happy if all the private gun owners gave up and found other things to do woth their time and money. Theor laws are intended to bring this about, by their very nature. They stop short (ususally) of outright bans because that doesn't look good to voters, but they do everything else they can to make it a burden, so fewer and fewer people will bother with the hassle.
Firearms makers/distributors who cut off sales to a state also want those state's gun owners to suffer. But for the opposite reason. They have had to shut down doing business with you because of the risk from your govt. They are taking a hit to do this, but think they must in order to keep in business. Because they are taking a hit, you do to, and your suffering is intentional. Maybe because you are suffering, you will get off your butts and do something about the govt that is the underlying cause of our pain.
What else can they do? States only care about voters (and tax money), and out of state businesses can't influence them very much. IF ALL gun suppliers stopped selling to a state govt, that might have an impact, but that is really unlikely. So their only choice is to tick off their former customers, in the hopes that those angry (voting tax paying) people will influence their state Govt in a manner positive to their business.
If you must look to someone for betrayal, look to your fellow citizens, and the individual they (and you) have elected.
Face it, we are a minority. The only time a minority can exert influence is when it acts with solidarity. If ALL they gun owners in your state would for once all vote together, AND let the politicians and the press know why things may be changed.
We are too fractured for that to happen, sadly, because a lot of people, even though they may own guns and shoot, vote away from gun rights, because other things are more important to them. Electing anti gun politicians, because you agree with their stance on other issues is what got us to this point in the first place.
It is hard, but it can be done, if the threat is percieved to be great enough. Look at '94. And don't believe the press when it says it was the republican "Contract with America" it was the gun issue. It was the AWB. It was the Democrats pi**ing off enough gun owners at the same time. We voted their sorry selves out. And they knew it! The press would never admit it, but the Dems did admit it to themselves.
If you can pull something like this off in New York state, New York would be a good place to live, again. Good Luck.