Once again after triple checking that the gun is empty:
The rear toggle pin only goes out from right towards the left side looking down on the gun.
Let's let it soak a bit longer, overnight perhaps.
Then I would take a short piece of wood like a 2x4 and drill a hole, maybe 3/8" diameter and about an inch deep. You will lie the left side of the barrel extension assy. flat on the block and very carefully use a brass punch to drive the toggle pin from the right side out of the left. Place it on the wood so that the pin will go down into the hole that you drilled. Be careful and don't go all brutal on it.
A bit of heat from a hair dryer style heat gun may help too, but it will make the part hot and harder to handle. Also you could apply some heat and they re-emerge the gun in the penetrant soak. (Those heat guns are quite inexpensive at your local Harbor Freight type of tool store. ) Actually, heating the stuck parts and then re-soaking the gun (without grips of course), may be the solution to your problems.
Again, soak it in a good penetrant, dry it well and apply a bit of heat (no flames), use a brass drift pin punch, support the part well on wood, and tap right to left.
Be careful and remember that the damage you do can not be undone.
Another option I should mention is to slap a stamp on it and send it to the LugerDoc.
If you have any questions or doubts, please stop and post your concerns. Do not rush or feel like you have to get it apart now. Patience.
dju
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