JDW,
If pressed I'd guess that was black walnut.
IME, Stereotype claro with figure is relatively lighter colored and more open grained than black, and has fiddleback and wild grain flows. Stereotype figured black walnut is darker, tighter grained, and has crotch feathering like your gun.

I've seen feathered claro blanks that I thought looked like high grade black. All my experience is based on accepting the seller's description of the wood source. I don't think they have the DNA results for the wood.