Yes rim thickness. I worked on extractor last night and cycling manual it seems to be working. I have not had time to test fire it yet. I tried to post picture of what it's doing but I couldn't get it to upload. Not computer smart I guess. But I could before working on extractor put a case in bolt with the bolt removed from the upper and it would hold the case at an angle without wanting to release it. Now they pop out instanly.
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