I found this Zabala/Kassnar 10 gauge on GunBroker:
http://www.gunbroker.com/Auction/ViewItem.asp?Item=63107495I'm also looking at a Churchill:
http://www.collectorsfirearms.com/admin/product_details.php?itemID=9404 These guns appear similar to what I need although I'm unsure about the chokes. Anyone know the quality of these guns? Specifically the Churchill verses the Zabala. Is this Churchill the same gun you said handled like a roughly hewn chunk of wood Yogi?
Edit: The Zabala at least has fixed chokes. Anyone know what the chances are of finding a 10gauge sxs with interchangable chokes? Also, can a gunsmith modify a gun with fixed chokes to interchangable and how hard is it for them to do? Will it shorten the barrells?