The gun is a semiautomatic .22 rifle made by Mossberg. Not much of an accessory market for that gun. What are you looking for?
sales@countrygunsmith.net
No
Yes. Gun show, gun shop, pawn shop, want ad
Try e-gunparts.com, Shotgun News, Gun List.
I THINK your rifle is the Mossberg Model 353. Among other sources for magazines, check the website for Havlin Sales. Mr. Vic Havlin and his wife Cheryl run the Mossberg Collectors Association, and are very knowledgable people.
Just have to be lucky I guess. I spent 20 years looking for a clip for mine, and finally just today I found one at a gun show. I don't know if this applies to every other part of this gun, but I finally found a clip that is compatable and it is a Mossberg 350. At least that is what it was tagged as. I think thats just the series though. The exact model number in the book said Mossberg 353 will work, so I'm not sure if the tag was wrong or what. Anyway, Hope this helps somebody out.