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Ebay Could Owe $1.9 Billion in Fines for Allowing Sale of 343,000 Emissions Defeat Devices
(www.thedrive.com)
This is a most excellent place for technology news and articles.
Legally speaking, it is a machine gun, but yes I do share your sentiment that it is not one.
You won't get prosecuted for it though as long as you don't possess a weapon that it can fit in.