It's actually called Spike 80 DF.
(DF is for Dry Flowable.)
https://www.corteva.us/products-and-solutions/land-management/spike-80df.html
It'll kill absolutely any plant life indiscriminately.
I can only state the obvious.
It’s a takedown model and its value has been diminished due to the rebluing so it’s more likely a shooter than a valuable collectible.
Have a competent gunsmith check it for safety and enjoy shooting it is my take.
It’s a beautiful gun overall.
Now, doesn’t this sound a lot like what happened some years back at a shop in Metairie?
What was that place called? American something or another?
Hopefully this will turn out better.