You can simply mail a ML rifle or shotgun (not a firearm with a ML barrel like a regular Encore), but anything that can be considered concealable like a cap and ball revolver, must be shipped by someone like UPS. That’s as of the last time I checked the ATF and postal regs a few years ago. Best to check again unless you feel lucky.
Barring a problem with state laws at either end, the gun you describe can just go UPS or Fedex, by law, but if you insure it and have to tell the locals what’s in the box, be prepared for some trouble from dumbazz clerks. Knight sent my rifle right to me a few months ago.
