Originally Posted by lazylabs
I've seen that on every salt/pepper stock I have ever had. I get other colors since they don't seem to show it as much.
Chances are, the laminated stock you bought was made with material from Rutland Plywood.
For some reason, the black/black panels seem to encorporate more of the rust colored flecks you are describing. It is streaking in the birch wood that does not take the dye.
I used to hate them, but learned to deal with them as they do add character.
If the stock is un-finished, and they really bother you, you can hit them with some black Aniline Dye.