The pin is stuck in place by dried out grease, more than likely. As John suggested, find a non-marring surface you can drill a shallow hole into, make the hole slightly larger than the pin diameter. Lay the upper receiver on its left, (safety) side with the pin positioned directly over the hole. Secure the upper to the table with a padded "C" clamp or similar. Cover the balance of the upper with a thick shop towel or other cover, which will prevent scratches or marring, should the punch or hammer slip. Then briskly tap the pin until it moves. The toggle itself will prevent any bending or warping of the upper receivers "fork tongs", as it is firmly wedged between them.
If even this does not work, you might consider gently heating the area, (NOT enough to cause damage or discoloration to the pistol's blueing!!), then repeating the above process.
Good Luck!
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