There are a bunch of gun builders named Rizzini, here is some information concerning the Rizzini that builds the BR550.
"B. Rizzini The company's advertising material claims that B. Rizzini is "The Original Rizzini". That claim must be justified by the fact that it was founded in 1965, before any of the other Rizzini companies that are still in operation. The company makes O/U shotguns and double rifles in a variety of models and grades, in medium-to-high quality and price ranges. In the past their guns have been imported to the USA by William Larkin Moore, New England Arms Corp, and Sigarms, and they are now imported by Rizzini USA.
Rizzini made a model distributed by Sig and known as the Sig SA5 (but not the Sig SA3) and later (beginning about 2000) produced several models generally referred to as Sig Rizzini. Based on Sig's projection of how many guns they could sell, Battista Rizzini invested in computer-controlled machine tools capable of a high production rate. Unfortunately, Sig's orders from Rizzini were a small fraction of what Battista expected, and their contract did not specify a minimum that Sig had to take. As a result, by 2003 Battista had to find another way to sell guns in order to generate the volume it took to pay for the tooling.
Enter Rich Cole, of Cole Gunsmithing. Rich and Battista formed some sort of partnership and founded Rizzini USA to import and distribute a line of guns that were based on the same action as used in the Sig line, but included more models and options. Rizzini USA initially operated out of Cole's building and Cole Gunsmithing was the official factory service center and custom shop, as well as one of the retail dealers for Rizzini USA. As a result of a disagreement between Rich Cole and Battista Rizzini over business practices, Cole has now completely separated himself from Rizzini USA, they have moved to a new location, and Rich sold off the remaining Rizzini inventory held by Cole Gunsmithing. Since Cole is no longer the factory-authorized service center, they cannot honor Rizzini USA warranties, and Rizzini USA has made other service arrangements. In the meantime, Sig got really ticked at Battista Rizzini for bypassing them and going with Cole, and they didn't like having to compete against Rizzini USA. Therefore they dropped the Rizzini line and sold off their remaining inventory, largely through CDNN. However, Sig will continue to honor warranties still in effect on Sig Rizzinis (although as far as I know neither Cole nor Rizzini USA will honor Sig's warranties). The Sig Rizzinis are so similar to the guns distributed by Rizzini USA that parts for them should not be a problem.
Battista Rizzini's company has been very successful in recent years. So successful, he recently bought Ferlib, a very small manufacturer of high-quality, hand-crafted, expensive shotguns. Ivano Tanfoglio, former owner of Ferlib, has collaborated with Battista in such projects as Rizzini's round-body game gun.
The Guerini brothers (I don't know their first names) worked for their Uncle Battista Rizzini for some years and were credited (by some people in the industry) with a large share of the success of the company. The scuttlebutt has it that they decided to ask Battista to allow them to invest in the company and eventually own a share of it. Within minutes after broaching the subject, they found themselves out the door and out of a job. Battista himself is nearing retirement age, but he has a couple of children who might take over the company. The scuttlebutt is that he is grooming his daughter Moira to take over.
It was widely reported that the Guerini brothers were both shocked and hurt by Battista's action, because they felt a genuine affection for their uncle. (I know, that sounds like the Guerini side of it - every story has two sides.) But life goes on, and they needed to make a living, so they secured financial backing to go into business for themselves, naming their company Caesar Guerini, after one of their ancestors. They have been quite successful in competing with their uncle."
While not a direct quote the bulk of this information came from Shotgunworld.com, they cover all shotguns not just doubles and some very knowledgeable people over there.
