Just what is an 1831 Springfield? That could be marked on a model 1816 US flintlock musket, Type II or Type III. You will have a hard time finding parts, but you might check internet site like oldguns.net or antiqueguns.com. You might have a chance of finding some at a large gun show.
Try Craig's List. It has everything
That model is obsolete, but we have a good selection of parts. email@example.com
Try www.e-gunparts.com They have parts for all guns.- Gene Watson
Numrich Arms,Gun Parts inc
Numrich will have parts if anyone does. They're reliable but not the cheapest. Many gun shows have dealers who break old guns down for parts. If you google "parts, springfield model 52a" you should get a few leads if there are any.
Parts of Savage Springfield Model 18 are available at Gun Parts Corporation. These can also be bought from Field and Stream.
Ibm type 1831