This rifle will have not only a grip cap, but a forend tip as well. I bought a piece of ebony, but it looked much more brown than the black I have had in the past. I've read about how oily it is supposed to be and some issues using it for forend tips. I bought a piece of African Blackwood, which is touted to be much more stable and dry. The ebony is on the left, darker blackwood on the right:

[Linked Image from i.imgur.com]

I cut the stock and added the tip. I used West System epoxy with the slow cure hardener. I mixed it and used fine sanding dust from the belt sander of the blackwood to mix in and color it. I drilled the cap and stock for a small dowel rod to help hold it.

[Linked Image from i.imgur.com]

I am debating using a slice of the blackwood as a grip cap to match as well. The grip cap is more acorn shaped, or more like a tear drop shape. I am open to suggestions.