with real walnut. When I was a kid on an Iowa farm we had some black walnut trees so I became familiar with how the green hull over the nut turns dark and soft in the fall and exudes this very staining juice of course. I remember some walnuts falling in an old tub under one tree and the rain water in the tub became, of course, walnut stain color. Now, I know this would be a lot of trouble but if a person were in to doing "buckskinning" type of activities it might be sort of fun to color some gun naturally. I am not a big project person on guns but I am now on my 2nd inexpensive, used .22 (Stevens 89 from later 70s or so) stripped the wood and refinishing the inexpensive wood with Birchwood Case products.