Standard fFirearms Catalog
You need to start by being very lucky. Meriden owned by Sears) introduced the Model 15 Slide-action rifle in the fall of 1912. In 1918 Sears announced that the Meriden Firearms Company would discontinue the manufacture of sporting firearms. Depending on the parts that you need for your century old rifle, there are a few available on the website for gunpartscorp. Good luck!
We have parts for that model. email@example.com
That model is obsolete, but we have a good selection of parts. firstname.lastname@example.org
Go to Numrich Gun Parts Corp.
Numrich Arms is a good source for gun parts.
Check with a gunsmith, or find the model number of your rifle, and check on line parts supply houses, like gunpartscorp.com
The Sears model 2200 is the same as a Savage Model 80 Series A.
The Sears Model 42DL .22 caliber rifle was manufactured by Marlin Firearms, their Model 80. Check with Marlin for parts availability.