They are made by Connecticut Shotgun Mfg Co (CSMCo). Under the same roof at their factory in New Britain Ct.
CSMC makes the high grade SxS and O/U shotguns and DR's. AH Fox and Win 21 both licensed, Parker licensed from Remington. And a line of others designed and built in house that go from just under 2k to about anything you care to spend.
The Standard Mfg is a spin off company. Same people, same machines making products not in the same mainstream as the above. Some not even in the same universe.
Keep those skilled people and $$ machine tools busy.
Some skilled workers from Colt were hired by CSMC a few years ago that had worked on Colt;s SAA and 1911 line. They had been let go by Colt it was my understanding when talking to the owner Tony Galazan a few years back at a shoot in Pa. He had the SAA's and 1911 there for show at the time.
(I had done engraving for CSMC for several years starting in '91 and up until about 2008/09. Somewhere in there.. Freelance, not in house.)
If he's bought up any or all of US Pat F/A 's equipment, I wouldn't be surprised.
He's done that plenty of times in the past, buying out a factory or other mfg and having several trailer loads of 'stuff' trucked back to N/B Ct.
If he can use it we will, if not it's looked at as a profit maker simple as that. If neither he wouldn't have bought it.
He might even have some of the employees from USPF/A working for him now.
That all happened when Ithaca Classic Doubles in Victor, NY went under in the early 2000's ('03?). Most all of the incompleted shotguns, parts, stocks ect and couple of the employees went east to CSMCo/NewBritain. There wasn't much machinery in that facility to bother moving.
He wanted me to move there too, but I had already had my time in central Ct in the 70's.