Stock sheen is a mixture of wax and rottenstone it gives a satin finish and makes the stock smooth, its made by Birchwood Casy also.
You can buy rottenstone and mix it with a liquid wax and apply it with a rag, let dry and wipe it off and buff with a soft rag. you can use mineral oil instead of wax but wipe it off right away. be gentle when wipping on and off,.