[darkgael]

Let me be the naysayer here. I keep looking at pictures of that gun and every one shows a coating of heavy rust. I would not shoot that gun.
Have you had it xrayed?
Do you know how deep the rust pits actually go? What the effect is of two or three deep pits linked together is on the structural integity of the gun.
Remember that stress damage is cumulative. Just because the gun did not blowup already does not mean it is safe to fire.