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First, I've never done that, second, I don't know if you have the entire assembly or just the wood, but..
If you have the assembly, looks like it will slide right off the front if 1. Barrel lock mechanism is removed (1 screw, beware of magazine spring sproinging) 2. Receiver is undone far enough to tilt up sliding block to release the action arm thingie.
Start with barrel off. Receiver upside down, barrel side facing to right.
Push thru and out the big pin holding in trigger group.
Slide trigger group forward (your right) until wing tabs will fit up through the keyholes and remove it.
Shell stops will then likely fall out or come out by pushing pins from outside (keep track which is which.
You can then find the spot where the sliding block can be tipped up on forward (your right) side to release the action arm and I suspect entire forearm will slide straight off the magazine.
If all you have is a piece of wood at that point you can figure out how the assembly comes apart.
Good luck.
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