You will have to contact Mossberg to find out.
Mossberg made all their rifles in the USA.
Mossberg made Westernfield shotguns and rifles for department stores. My Westernfield shotgun is identical to a Mossberg 500.
You will have to call Mossberg
They were originally made in New Haven Ct. Some are now made in South America. You can check with Mossberg Customer Service through their website.
The Lakefield factory in Ontario Canada has made rifles for a number of different brands, Cooey, Lakefield Mossberg, and now they manufacture all of Savage's rimfire rifles. Its no surprise if they use the same detachable magazine.
There were several Mossberg .22 rifles that load through the stock. The 51M, 151K, ect. These have a removable inner rod that is draw back through the buttplate, and cartridges are inserted into an angled hole in the side of the stock. Mossberg also made rifles that loaded from a box type magazine, and an under barrel tube magazine. There are more than 100 different Mossberg 22 rifles made.
Mossberg made a LOT of .22 rifles- there are dozens of different models. If you can give us a model number, we can tell you what years they were made.
Havlin's book on Mossberg history should have the answer.
A model 80 WHAT? Mossberg made rifles, shotguns, and pistols. If a local gun shop does not have the part you need, you may find it at gunpartscorp.com.
1938-1941. Production stopped due to WW II.
The Mossberg Mdl 46B(b) was made from 1947-1949. I happen to have one- sweet rifles!