If you're not familiar with it, there are four varieties of walnut that are used for stocks. The first, Juglans regia, is the tree with thin-shelled nuts that grows in France, England, and Turkey. Second is American black walnut, Juglans nigra, which is not as desirable. It's more porous, somewhat heavier, and in its plain grades, furnishes most of our factory wood stocks. In its fancier grades, it can cause you to wet yourself. Claro walnut comes from California. It's more porous and not as strong as other varieties, but its colors are spectacular. Bastogne walnut is a hybrid of claro and black, and produces spectacular wood. It's heavy and strong, and I've had at least one stockmaker refuse to work on a Bastogne blank for which I had paid a lot of money. Its grain was too irregular, he said, and he wasn't getting involved.