FAIR guns are well made, but probably not to the standard of the B. Rizzini guns. However IIRC there's a pretty large price differential there as well. I own two FAIR guns; one a Verona, which is the O/U and the other a S X S Iside Tartaruga Gold. Used them both for several years/seasons. The Verona handles very much like a Beretta. The Iside is a nice little S X S that comes with very good triggers. They're certainly not "top tier" Italian guns, but well worth their costs. I bought the Verona used and the Iside new. Sorry, but I have no idea if they share any parts or services, but my gut feeling is "no".

Verona on the left and Iside on the right:

[Linked Image from jpgbox.com]