Yeah, I have shipped handguns UPS to the original manufacturer for warranty work... I know that's legal, but you should see the look on the UPS employs face when they ask about the contents of the package.
They all scramble to the back of the store to pow-wow with the manager while thumbing through procedural manuals.
I used to live on the GA/SC border and everyone I knew would regularly buy/sell long guns in person without giving it a second thought.
Strange thing here is that Ohio law specifically allows buying/selling of long guns with residents of bordering states with no mention of the federal prohibition... It's kinda misleading.