If a gun fails to extract there are a few things to consider. When was the last time the gun was cleaned well? If the gun hasn't been cleaned in 20 years then that's probably the issue since carbon and debris has been building up over the years.
Another thing to consider; Is the extractor warn? The life of an extractor is to snap over a rim and pull a case out of the chamber and hold onto it until the ejector knocks the case out of the gun. If the angle is warn out it won't do it's job anymore. If the extractor is good then we need to dig deeper.
Look at the chamber. Is is a mess? It should be polished to a mirror. Most factory gun chambers are not as polished as they need to be. There are tiny grooves from the chamber reamer and dust, dirt, and carbon will latch onto these grooves and create problems.
A few other things to look at in semi auto guns. Is there a burr in the chamber mouth? This will happen over time because the bolt slams back and slams home on the chamber mouth. And also is the firing pin too long? A firing pin that is too long will eventually create a burr on the chamber mouth. You find this in .22 pistols because the firing pin needs to hit the rim of the case for it to fire. So if there is no case when you dry fire the long firing pin slams into the chamber mouth.
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