A) I would look at the extractor. If it is worn or damaged, it may not pull the cartridge out. B) When was the recoil spring replaced? An old spring can create a lot of problems. Parts slamming against each other, etc...
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)