Walnut Gunstock Blank
American Black Walnut
Which is generally straighter grain and easier to work than European Walnut.
Blanks are standard which should be free of all but minor blemishes and with minimal sapwood,
Premium are the nicest of the batch but the standard ones are pretty good too.
Available in 50mm and 58mm thick,
I've dressed them so you should be able to go right up to the width but even then 50mm is on the thin side so be aware of this while ordering.