You should be able to find a parts diagram and parts list for your version of the gun here http://www.e-gunparts.com/model.asp?idDept=85
What do you mean by "drop" a round? "Fail to eject" I understand, but what is "drop"?
I am not familiar with the Franchi, but I know from experience with a Beretta that failure to eject is often caused by plugged gas ports. In that case, the bolt pulls the hull out or partly out of the chamber, but doesn't throw it clear out of the ejection port. The ports need to be cleaned thoroughly using a probe that is close to the diameter of the port. For a Beretta 391, I have found that a 1/8" drill bit (held in my fingers) will ream out the carbon without cutting into the metal. Your gun may have ports of a different diameter.
If the bolt of your gun opens but doesn't pull the hull out of the chamber, that is a different problem, probably a worn or broken extractor.
What do you mean by "drop" a round? "Fail to eject" I understand, but what is "drop"?
I am not familiar with the Franchi, but I know from experience with a Beretta that failure to eject is often caused by plugged gas ports. In that case, the bolt pulls the hull out or partly out of the chamber, but doesn't throw it clear out of the ejection port. The ports need to be cleaned thoroughly using a probe that is close to the diameter of the port. For a Beretta 391, I have found that a 1/8" drill bit (held in my fingers) will ream out the carbon without cutting into the metal. Your gun may have ports of a different diameter.
If the bolt of your gun opens but doesn't pull the hull out of the chamber, that is a different problem, probably a worn or broken extractor.