Common problem with these. You have to look at the bolt/extractor very closely as you slowly close and then open the bolt on a cartridge case.
Many of them don't allow the claw of the extractor to grab the case rim securely.
Sometimes it's the slot in the bolt itself that isn't deep enough to allow the extractor to pivot towards the case far enough.
Sometimes the slot in the bbl for the extractor is too shallow and doesn't allow the extractor to get a hold of the case rim when the bolt is closed. Sometimes both conditions are present.
The latter can cause the extractor to be pivoted outwards and beyond it's limit in some guns and that leads to the extractor breaking.
A good secure angle of the claw to the rim helps. Even a touch over center is OK but don't over-do it. A negative angle and a rounded tip to the claw can let the extractor slip off the case rim as the bolt is pulled back,,especially if the case sticks in the chamber the least little bit.
Add a weak extractor spring to the mix and the extractor will slip off the case rims no matter how sharp and clean it's shaped.
Too strong of a spring will make for the bolt closing with difficulty.
You can even get some to fire when the bolt is being closed quickly if the spring is too strong,,the extractor acts as a firing pin against the rim. That's true for most any RF.
It's balancing act and for such a small simple part and a spring & plunger, there can be a lot to getting it to function correctly. sometimes.
They can also take a long 'where'd it go' flight on you while working with them. Amazing how far they can fly and how well they can hide.
