Sell and Ship Air Gun Parts Internationally from the US?

I’m planning to start selling custom 3D printed grips for air pistols, based in the U.S.

I was wondering if anyone here has experience selling air gun parts internationally. Specifically:
  • Are there any legal restrictions on exporting airgun parts from the U.S. to other countries?
  • Do I need any special license or paperwork?
  • Any tips on shipping them overseas, like which couriers to use or what to declare?
  • Is it allowed to list and sell these internationally on eBay, or is it U.S.-only?
Any advice or real-world experience would be greatly appreciated. Thanks in advance!
 
so, the grips are just parts and that is all that need to be said if that
and know PA ships to the UK with no problem and i mean air pistols, i read and post on UK for and the replica guy show them off
shipping will be interesting it appears Krale in the Netherlands uses UPS
Chambers and Knibbs and Protek use the UK mail system which goes into our mail system
i would think small packages either bag or box would be best in the USPS
you would declare an amount at least that is what they do in the UK
i see many Ebay seller ship around the world
now reality it will not be cheap and you will have to know the cost before the sale so everyone is on the same page and or so you don't lose your A$$ saying the wrong as in too low of amount
 
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