I recently acquired a pre 68 Mossberg 500AT that was left neglected in a hoarders home. It has gotten wet and of course rusted. I was able to clean the barrel and innerds but have a problem with the bolt. The extractors are rusted and won't freely move. I've soaked them in PB Blaster, but can't get the pin to remove them to budge.
Will a newer bolt be compatale? This is one with the single action bar instead of the newer double. Complete bolts and carriers are available on EBay reasonably, but will they fit the older shotgun?