Most if not all 46 and 146 rifles beech and birch? No.

Many are walnut as this one appears to be.

I have seen hundreds of these rifles as imported by SARCO and many had walnut stocks as does my 46 and also my 146.

The beech factory commercial stocks are commonly stained a dark almost blackish hue which may be a special concoction to get the wood to take the stain. Both beech and birch are difficult woods to stain. Many beech stocks also feel somewhat "rough" to the touch and I surmise this also may be a production feature to get the wood to take stain.

Whereas many military 96's and 38's have quite light-colored beech stocks, I do not recall ever seeing and unmolested factory HVA 640 series rifle with a light blond stock. Maybe Ken from Kebco can comment as I have a great memory, it's just so short...