help to id a rifle i was told was a carcano

[vintage hunter]

they say the mgr was taking the gun apart and it slipped out his hard and landed on table

It's been known to happen, I've repaired several over the years that were broken off from being dropped......one of which was mine

A steel bolt handle? This thing ain't made of glass...

Heating/welding to re-shape the bolt handle tends to cause the steel to become quite brittle. If it's dropped and lands just so the handle can snap right off like glass.
The pictured bolt is from a bubba'd M41 I restored a while back. This is how it was when I got it, don't have a clue as to what caused it to break.