Best I can tell, your Spanish shotgun el faisan (the pheasant) elgoibar shotgun was made in the 1960's or 70's. I found this reference:
This import company bought the import company that imported the "El Faisan" <!--EZCODE AUTOLINK START--><a href="http://www.tristarsportingarms.com/">www.tristarsportingarms.com/</a><!--EZCODE AUTOLINK END-->
You may be able to track parts from there.
Good luck
Barrel, stock,
You can get some double barrel parts from GUNPARTS. com
it is a Stevens, parts are interchangeable...
No.
American Gun CO. double barrel 271026
Try e-gunparts.com
Numrich Gun Parts Corp. online at ww.gunpartscorp.com
Try e-gunparts.com
We have SOME original parts for that model, we make others. sales@countrygunsmith.net
Look up Numrich at I think: gun parts inc west hurley NY
Try Gun Parts Corp. They have parts for nearly every gun ever made.
We've got quite a few parts for that model. sales@countrygunsmith.net