Asked in Sears Roebuck Firearms
Where can you find schematics for a 20 gauge Sears Roebuck Model 300 shotgun number 273.521260?
A Sears Moels 300 is a Winchester Model 1400. For a manual, go here:
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.