This model Cross refernces out to a Remington Sportsman 58, introduced in 1956, the Sportsman-58 was Remington's first gas-operated shotgun. You can request an owners manual for obsolete firearms at www.remington.com click on sportsmans library, then downloads, then owners manuals, then click obsolete owners manuals, you will have to register but it is worth it to get the free manual.
You can find an owners manual for a Savage Arms Foremost model 6670H, 12 gauge shotgun by contacting the company. The phone number to call for the manual is 413 642-4261.
The manual is downloadable from Remington's website.
Try gun shows.
Try want ads and on line auctions.
20 gauge autoloader. Many people buy a .410 as a first shotgun- not a good choice.
You can find what you need at webdept@gunpartscorp.com .
Not quite sure which model you have. Use the link below to find the owners manual for your gun. Follow the manual for dissassembly.
You can get it here:http://www.sears.com/en_us/customer-service/product-information/find-a-manual.html
http://www.histandard.info/manuals/sears/pashotguns/index.html
Are you looking for one? Try gun shops, auctions, on line searches for literature, other owners, etc..
Read the owner's manual or have a gunsmith do it.
Browning Auto-5 made in 1972. You can go to www.browning.com to get a downloadable PDF manual. sales@countrygunsmith.net