This appears to be a clone of the Beretta Companion folding shotgun. However, instead of having an action opening lever ahead of the trigger guard as in the Beretta guns, this appears to have a side lever. Additionally, according to the description, the barrel is rifled. I wonder if this is for slugs, or if this is similar to the Supra rifling found on the French becassier and Italian woodcock guns. I know Fabrica Nazionale d'Armi was a military arms producer, which makes this gun rather interesting.
https://www.gunbroker.com/Item/731165485
