I cannot figure out this, as the way it is written at usps.com is most confusing. If pre-1899 does it matter if longarm or handgun, obsolete round or one commercially produced? There is no sticky for this on the forum, that I could find. Also, if insured, is there an issue if one goes to claim if damaged or lost, that since this is a firearm, even though antique, such claim might not be honoured? Especially since contents do not have to be declared.