The 2nd "f" in "FFL" is for "firearms" ... airguns aren't firearms. Most gun laws don't pertain to airguns, including interstate selling and shipping. However, some states and/or locales have restrictions on airgun ownership/registration/use; so the buyer/recipient may have to comply in various ways. I think you'll see that some of the major airgun dealers won't ship to certain states; that will give you an idea who is restrictive.