I have a BL-22 and so does my youngest son. About four years ago he had failure to extract issues with his and upon close inspection from looking at both rifles there was a tiny coil spring under the extractor in his rifle that had disappeared. I wouldn’t have known this if not from looking at my rifle. There is a little round spot milled in the receiver behind the extractor where the spring sat so that may be your issue. If you didn’t know the spring was there you would never miss it. If it breaks it just falls in the bottom of the receiver and you can’t see it.
I sent his to a gunsmith and he fixed it and it has ran smoothly ever since. Good luck!
You have to be real careful about that damn spring when you disassemble the rifle. Likes to pop out.
