[Thor]

If it is the rear one that goes through the back of the receiver make sure you move right to left because of the lip on the left end. I would soak it in Kroil a day or two, then put it in a zip lock and put it in the freezer for a couple of days Then take it out and gently warm the reciever forks and try to tap it out again making sure you have a place for it to go to. I use a block for this with holes in it so the pin has a place to move to. It helps to have the rear toggle in place, I assume that is locked into place too, but you could have just the reciever forks with the pin through them. The rear toggle will help you keep from pushing and bending the fork alignment during removal.