Thanks for the link to your project, have it bookmarked.
Here's some bigger pics of the grips that came on mine, if anybody's interested. Like I said I'm pretty sure they're plastic.
The first three are from when I first got the gun, before any cleanup.
Next three are trying to show the material displaced by the wood screw and an unfinished edge.
Interesting change in colors, no? For the fumbling photogs like me out there, I thought this was interesting: Here's a couple pics taken minutes apart, same camera, same settings, same lighting, etc, just with different backgrounds.