Best left to a trained gunsmith. For normal cleaning, no disassembly is needed.
The 469 is very similar to the 59, 459, and 669. Gun Digest publishes an excellent series on Firearms Assembly and Disassembly and the Part 1 Automaic Pistols volume includes excellent instructions on disassembly of the model 59 series.
No
Use Google and search for '1917 Enfield rear sight'. There are a number of websites that can help you with disassembly, etc. Start with www.cruffler.com
Get a copy of the Gun Digest Asembly/Disassembly instructions for centerfire rifles. The Marlin Mod 36 is included.
Contact Marlin.
Best left to a trained gunsmith. For normal maintenance, no disassembly is needed.
www.savageparts.com has a schematic. I advise against disassembly unless you absolutely have to. sales@countrygunsmith.net
Call Beretta customer service.
Rifle, handgun or shotgun?
Try S&W web site.
Go to Smith and Wesson's website and download/request a manual. Find a bookstore and look for a series of books by J.B. Wood on fireams disassembly.