Remember how I mentioned misconceptions? Yea, so, 3D printing full guns is and always will be impossible. That's not to say that some parts can't be 3D printed but anyone who tries to 3D print each part and put it together will be lucky to live to tell the tell if they actually tried to fire it, if a 3D printed hammer can actually even set off the primer on the shell... No amount of plastic or 3D printer material can withstand the forces created when a live round goes off in a chamber. The parts that can safely be 3D printed are mostly already easily available elsewhere, and since 3D printers cost a fortune, that's a non-starter for even criminals.
As for your IC requirements, the things that are already required IRL should be required IC as well, if you're trying to legally get a firearm. No issues with mental health, no felony charges and no misdemeanor domestic assault charges. Physical address, no PO box. Your point about a stable job with decent income, shouldn't be a factor, however, because everything about getting a firearm IRL is expensive, and you'd realistically need decent income anyway. No one is going to ask you how you got the money though, or deny you if you can't provide proof of work... And the reasoning is the whole reason the SCOTUS is going against NY anyway. Constitutionally, no reason is just as valid as any reason, so, no, I don't believe that a reason should be a requirement, or, if you are required to give a reason as to why you want one, it should have zero effect on the outcome of the application.
Onto your final point, in states that don't try to take away our constitutional rights, it's just as much work to get a handgun as it is to get an AR-15. The only reason it SEEMS easier in NY is due to how NY handles firearms in general. With a handgun, in NY, you have to get a CCP (Concealed Carry Permit) to be able to buy a handgun. You don't have to get that permit for an AR-15 however. That permit is what the SCOTUS is trying to make NY change. Every state is going to do the same federal checks when you go to buy ANY gun.
That's three misconceptions in your one reply. That's why I personally think that everyone needs to keep their own personal beliefs out of the mix when talking about these laws in the server. Either go with option 1, and keep the law the way it's going to be when SCOTUS gets done in NY, with the same IRL requirements I brought up in an earlier paragraph, or RP things as if there was a global firearms manufacturing ban, and remove the ability for EVERYONE in the server to get a firearm. That said, going any route except option 1 already limits things on an OOC level, which, the claim is, this server isn't trying to do. If you are really not going to OOCly limit things, then this poll and this topic should be deleted and disregarded.
EDIT: Also, before I get called out about misconceptions myself, you may be able to actually 3D print all the parts to a .22 and get it to fire once or twice without blowing up and killing you, but I'm pretty sure the round wouldn't be lethal when it hit it's target, again, that's even if a 3D printed striker can set off the primer in the shell.