If I may, the OF-24 Tifone may well have been the first infantry fighting vehicle (IFV) taken into consideration by the Esercito Italiano / Italian army. As was mentioned above, OTO Melara began to work on the project in the 70s after evaluating the Mowag Taifun tank destroyer, a vehicle based on the earlier Gepard.
It looks as if three versions of the Tifone were under consideration and / or developed.
Tifone Mk 1, with a 76 mm gun in a turret - possibly the turret and gun of the British FV101 Scorpion (A 90 mm Cockerill weapon may have been envisioned at some point.)
Tifone Mk 2, with a 20 mm in a turret - possibly an OTO Melara turret with a Rheinmetall weapon
Tifone Mk 3, with two 20 mm antiaircraft guns in a turret - possibly an OTO Melara turret with two Rheinmetall weapons
The use and fate of the prototype or prorotypes after the end of thre trials is unclear. Indeed, it is unclear whether or not such prototype(s) actually carried their full armament.