CSMS is Tony Galazan. He has a bit of reputation and it’s not all good.
He owns the rights to make the Winchester model 21 and Fox shotguns. He also offer a lot of reproduction parts (recoil pads, plates, case labels, etc...) that seem to make their way onto a lot “original” guns.
That .22 double rifle has been in his catalog for quite a while. I suspect he had his company make it as a marketing tool and because he could.
I gave a quick background on how the small DR's came to be in my post above.
(Lucas 'Geiger' (sp?) was the gunsmith that hand made the first 2 as a side project in the CSMCo shop.
I couldn't remember his last name in my orig post above.)
I engraved a couple of the little DR's for CSMC when I was doing work on their other guns.. They were made of the same 8620 steel as the AH Fox and Win 21's they make. All the options that the full size guns had available.
CSMC is allowed by licensing agreements to make the AH Fox and Win 21 and use those names on them from their current owners. Savage still owns the AH Fox name.
That agreement was made back in the early 90's.
The Winchester 21 build agreement came later. CSMC was asked to build the 21 for Winchester altogether at first which they did.
Winchester did the marketing, took the orders, ect. CSMC did the build.
Then later CSMC took the licensing agreement similar to the AHFox .
CSMC pays a fee for every gun made under each name but sold as a CSMC mfg piece.
I'm sure it's much more complicated than that, but that's the simple layout.
I don't know who or what owns the Winchester 21 name anymore.