Touching up B&C stock

Got a Bell & Carlson stock for a Remage build. It's the brown with black spiderweb. I had to open up the barrel channel for the CBI barrel. Does anyone know what color to touch up the channel with? I'm looking at craft acrylics online but don't trust the accuracy of the color chips. Anyone been there done that and knows a good color match? Thanks

You can always blend the acrylics until you get a color match that you like just as an artist does on a pallet.

The wife took me to the craft store and I picked up a few colors. Says dishwasher safe once dry so it should be fine in the Oregon rain. I'll be giving it a try tonight.