1. It must have 95%++ useful life left in the metal, ie. no gaps, rattlin, movement,....
2. Quality engraving is a must, no "stick-style" engraving!
3. Most important: IT MUST HAVE EXTRA WOOD TO SHAVE OFF IF PRN! Think custom fit here, like in those PB SO guns that have that stump you can have shaped to your dimensions.
Here is a perfect example of clay/pigeon buster:
http://www.collectorsfirearms.com/admin/product_details.php?itemID=8850
PS. One of a kind, or rare is preferred, I like to steal the show.