you can find them in the numrich catalog or there web site 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.
www.e-gunparts.com
I need butt end of a duble barrowl shotgun 1017 sears.
Your 12 g pump shotgun was made for Sears by the High Standard Company- it was their Flite King model shotgun.
http://www.histandard.info/PDF/Sears%20Shotguns.pdf
Try gunpartscorp website. They have a cross reference to find the make and model of your Sears shotgun.
That should be a Savage/Springfield Model 18. If you can't find parts from a local gunsmith, try http://www.e-gunparts.com i have a sears roebuck bolt action .410 shotgun model 110.1120 3''. i need the shell ejector piece. to get a clip for a shotgun try marlinguns.com.
The sears model 200 is a Winchester 1200. That will make it easier to find info. I have one of these, with adjustable choke and vent rib. It is a sweet shooting and smooth little shotgun.
Sears model 200 is Winchester 1200 try your local gunshop.
I have one for sale. Message me @ garym6@cox.net
Numrich has a gun parts website. Best bet for any gun parts or schematics...
Try Numrichgunparts.com