If you're inquiring about a double barrel 12 gauge with double triggers, with Barrett Gun Co engraved on it, I don't think you are gonna find much info on it. I've had one for years and can't find anything about this company and if it ever even existed!
Call the company if still in business, look for books published on the company.
According to Wikipedia, the Interarms company of Alexandria, Virginia went out of business in early 1990s
Remington is a likely candidate. They are also the oldest US gun maker still in business.
No. The Ithaca Gun Company went out of business in July 2005. True they went out of Business, however, they reopened at the beginning of the year. Website is: www.ithacagunsusa.com
Iver Johnson went out of business in 1993, reorganized, and came back in business in 2004. Their web site is http://www.iverjohnsonarms.com/
No
No. This company was founded in the late 1880s with premises in Bath Street and Price Street. The company was absorbed into/purchased by Parker Hale in the 1950s.
It's the UMP45 silenced. It is an overpowered gun. Or the Intervention or Barrett.
Sheridan started in 1945. Later it was purchased by Benjamin air gun company and Later Benjamin was purchased by Crosman air gun company. It is still in production.
Today Crosman air gun company in New York owns both the Benjamin and Sheridan line of airguns. And Yes they still make both of them. See the link below.
Find out who made it. See if they are still in business. Gun show, gun store, auction sites.
The current Barrett Firearms does not make a double shotgun. Exactly how is your gun marked?