Embarrassing: can't figure out how to remove the stock of my JKHan N400.

Uh, yes, so the title sums it up, but here's the long story: I have a JKHan N400 semi-bullpup. This gun: 

1531300779_21088985555b45cbaba46a95.63129556_jkhan-iluda-n400-pcp-55mm22.jpg


except mine's painted tactical black from factory. I've decided to soda-blast the paint away and stain and oil the wood instead.... but I can't figure out how to remove the stock from the gun.

The front stock is easy to remove, it's got a fastening bolt on the underside, but I can't find any bolt holding the rear stock. There are no bolts anywhere as far as I can see. I checked the exploded blueprint for the gun...

http://jkhanairrifle.com/main/images/N400-EXPLODED-VIEW-Final.pdf (PDF, in Korea = slow load. Note that #61 is the bolt holding the front stock)

...but if the answer is in there, I'm not seeing it. Obviously I'm overlooking something obvious. Any hints you guys can give me how to remove the rear stock welcomed. JKHan rifles are similar to Evanix, if that helps.