It used to be a Venezuelan army issue Mauser model 24/30 on the 1898 action as made by FN in Belgium. I can't tell the barrel length from the picture to say if it were a short rifle or a carbine.
Bubba cut the stock back and discarded the front band and bayonet lug.
If a short rifle, he bent the bolt handle down before hammering the knob flat, if a carbine, the bolt handle was already bent but he still mashed the knob flat to look like what he thought was a sporter style.
It is strictly a shooter, any collector interest or resale value is long gone.