www.e-gunparts.com
A Sears Moels 300 is a Winchester Model 1400. For a manual, go here: http://www.stevespages.com/page7b.htm For disassembly instructions, get a copy of Gun Digest Assembly/Disassembly for shotguns. Aslo, gunpartscorp.com has an on-line exploded diagram for the model 1400.
Check the diagram on Numrich website or in their book. egunparts.com The original manufacturer for your gun is High Standard model K2011.
Get a copy of the Gun Digest Asembly/Disassembly instructions for centerfire rifles. The Marlin Mod 36 is included.
Contact Marlin.
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?
I cannot find any instructions, however, the 59 breaks down like the 1911.
I would contact Remington directly.Their Customer service dept.should be able to help you.
savage model 25 pump action 22 long rifle
Post this question on rimfirecentral.com and I may be able to help you.
model 1903 hammerless .32