The Bulgarian stock is beech or birch and has a yellow-white color.
The lower handguard is some sort of European walnut and has a darker walnut color.
The upper handguard is laminated wood, probably birch or beech.
Getting a perfect match on all three is difficult due to the natural color of the woods used.
The finish is some sort of varnish-like surface finish mixed with a Tan-Brown stain.
Once the finish is off you have the natural color of the wood, with possibly some darkening due to oil soaking.
The hand guard and stock will come out pretty much the same color, with the lower handguard a little darker.
You can balance this out by staining the lower handguard a little lighter by thinning the stain you use.
One of the best stains for this is Tandy Eco-Flo leather dye. This is a water based dye that can be thinned with alcohol to give a lighter tint.
These dyes work better than most anything because they soak in instantly and give true colors.
Buy the Eco-Flow, NOT the Eco-Flo Cova. The Cova is more a paint for leather.
I refinished my Bulgarian hand guards with Tandy Cordovan dye, which is a Red-Brown color and finished with satin gloss polyurethane.
The butt stock is an Ironwood Designs laminated, but I also finished the Bulgarian original the same way. The match was very close.
I just very lightly thinned the full strength dye for the lower and used it full strength on the stock and upper handguard.
I do recommend experimenting on scrap wood to get the colors right.
A 5 gallon paint stir stick makes a great test strip since it's a light wood and paint stores usually give them away.
If you don't like the color of Cordovan and want a more orange look, buy Red and Yellow or Orange and mix your own.
Remember, real Russian wood color ranges from light dirty Orange, to a Red-Orange, to a Red-Brown.
Real Russian wood is not Red
Here's a site with pictures of real Russian wood:
http://tantal.kalashnikov.guns.ru/bstakwood.html
My upper and lower Bulgarian hand guards. Remember pictures usually make the color look redder than it is. .
My Ironwood Designs laminated stock: