Finally have a bit of time at the computer. Based on the more detailed description you gave Swede, that's definitely a Chinese laminate. Very nice!
I suspect you are probably right P32. Here in the desert Southwest, certain types of exposed wood simply doesn't last. We get a condition called dry rot that absolutely can trash wood in no time at all. I remember one time my dad was overseeing a project where a contractor installed some very nice/fancy poplar balusters on a widow's peak (think of it as a little balcony on the top of the roof, accessible via the attic) of the church in Old Town. They lasted only about 6 months through a single spring & summer before the combination of sun/heat/lack of humidity totally compromised their structure. The contractor had to take them all down and replace them with something else as they were disintegrating into small chunks of wood. They even had a very good quality exterior white paint on top of them & it didn't matter.
I have no idea the type of wood, my first guess would be Chu (Catalpa) just like the hardwood stocks are. That's what is believed that the Russians did with their laminated stocks (Laminated Birch, same as their hardwood stocks), I see no reason as to why the Chinese would do something differently but as you say Swede, if the typical stocks weren't very rot resistant, maybe they tried something else?
Serial number ranges for known laminate stocked guns are:
10360220: This one is the odd man out. I have no idea why this early gun has one of these, it could be a replacement stock as I have no record of the correct S/N on the stock. This one is interesting, however, because the stock has a side swivel. All the 11 mil laminates have bottom swivels. This is the nicest condition laminate I've seen, though it was Possibly refinished stateside? (I think the finger grooves are pretty well rounded over and the gloss is sickeningly shiny compared to what I think it should look like in my mind for a mid 10 mil /26\). Photos don't really provide concrete evidence one way or another, but if refinished that's quite a shame as this is a unique one!
11,479,xxx to 11,539,xxx. There are known examples of matching hardwood stocks within this range, so there is not a full 60k laminate stocked carbines out there. Here are some of the nicer more definitive photos I have of some of these:
Yeah, I'm still looking for one of these for certain. Maybe one day!