When you have to manually extract the cartridge case, do you do this by hand operating the toggle train?
Do you feel any particular resistance early in manually extracting a fired case?
If so, you might have some shape or surface finish issues in the chamber.
If you adjust spring length / tension be sure to use some masking tape at the rear of the frame between the receiver ears where the rear toggle will hit the frame. If recoil resistance gets too light, you could end up peening this area.
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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