I came to the conclusion that the reason my remington 1900 12ga was not opening easily was not repeat not because of the firing pins because they float. It has to be something else. I found the left ejector bent so I ordered a new one from wisner's. The new ejector does not fit precisely so I'm in the process of filing it down on the high spots but it does slide easily. It just doesn't sit flush against the breach like the right one does. I also got a new Joint Check. Thing is, the darned gun is still very difficult to open. There is huge resistance somewhere but I cannot locate it. Could it be the ejector springs are broken or the ejector hammers are sticky? If so why would it be difficult to open if the hammers and ejectors were already cocked.
