Firstly, please, please let us be able own semi automatic rifles with a 10 or 20 round magazine limit. Firearms play a huge role in most of my characters lives as they are a great hobby to have and having access to something other than a handgun or a pump shotgun would be a blessing. Obviously some attachments should be allowed for these firearms too like weapon lights, grips, dog sights or even magnified scopes. Not sure of the laws in NY 100% about the legality of these firearms and their attachments, but I think it would be something very cool to see here.
As far as OOC restrictions go and I am sure not everyone is going to agree with me, but I believe firearms license holders should not be able to drop or give their firearms to other players, like at all, unless it's to another legal license holder. I think this would stop a ton of any potential abuse surrounding these tools. Character hours and limit on how many firearms you can buy should not be limited in my very own opinion.
Regarding CCWs, I would go with what the Supreme Court had just recently put out, so are you going to see more people carrying their firearms around? Most definitely. Character portrayal issues and other concerns surrounding all that should be reported on an individual basis.
edit: apologizes if what I am saying doesn't make much sense I am writing this on my phone and am extremely tired