Ouch.......
Like i said, they are very simple, if you get it out, give it a good buff and it should be good to go. They seem to hold up pretty well. Worst case, depending on rust, you may need a new bolt and spring.
If you still can't get it free, you may need to drop the bobtach too. The tilt ram pin and two pins on the sides. Get it off, flip it over so you have good access. Get in there and you can get heat and or pound it with a sledge hammer. Just be careful, the pins may be hardened. I have made this mistake before, hardened pin + hardened hammer = high speed shrapnel, i got hit in the knee, needed to use a strong magnet to dig it out..... Not my finest moment.