✅ SOLVED What is It??

[1966Goat]

Found this in a river near Civil War activity. May be just junk. Looks like the base ring compresses and slides into something.
Thanks for your help in advance!
(This is my First time posting to TN.)
Alex S;

 

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[firemanphob]

Maybe a hardened point from a pavement milling machine or a rock drilling head?

 

[Icewing]

It's a tooth from a trencher.

https://www.bing.com/images/search?q=Bullet+Trencher+Tooth&FORM=IRTRRL

 

[ticndig]

one of the two guesses above for sure .

 

[1966Goat]

Thank you gentleman for a quick response!
There is also an old rock mine in the area, so that looks like it.
Thanks again!!