Marlin sells parts for these rifles as does Numrich. Marlin at - www.marlinfirearms.com Numrich at - http://www.e-gunparts.com/model.asp?idDept=158
If you go to Marlin's web site you can download a pdf file of the manual, which includes instructions on how to disassemble your 1894. http://www.marlinfirearms.com/pdfs/manuals/MFC_Centerfire_1894.pdf
Try the Marlin web site or eBay. Try the Marlin web site or eBay.
For Marlin manufacture dates head to the site linked below. (see related link at the bottom)
The Wikipedia site for marlin 336 rifles includes a table showing how to use the serial number to find date of manufacture.
The Marlin Firearm company has owner manuals for the different firearm models that they sell. You can find downloadable versions of the manuals on the company web site.
Left side under the rear site. That's where it is on my 99M1.
you should be able to find everything at this site www.e-gunparts.com/dept.asp drawings and parts
MARLIN GUN COLLECTORS HAVE A WEB SITE, GOOGLE IT
look on the net for a marlin gun collectors site, they have that info.
there is a marlin collectors site or gunbroker.com
Age is 1966 from the AB prefix. You can find diagrams at Gun Parts Corp. web site.
I would start looking at Numrich Gun Parts Corp.They may be found on the web.Also check Brownells Gunsmithing catalog.