There are a few restrictions to be aware of but you need to research the latest laws. For example, you cannot sell to anyone in IL without a FOID card. You'd need to get a copy of the Foid card and a govt issued ID that matches and the address you ship to also has to match the ID and card. In NYS, you can only buy ammo for a handgun if you have a NYS pistol permit. Many states, cities and counties have restrictions on magazine capacity like MA, CA and Cook County, IL. These are just a few examples but you can see, there are more than a few restrictions to consider. If you go to a national seller's website you can see their restrictions. Sites like Sportsman's Guide, etc. To keep it simple, some companies just don't do business with any restricted states but you will find that people from the restricted areas will do business with companies that work with them (legally) instead of just refusing to do business with them.