Several years ago, and maybe 2,000 rounds, I purchased a CETME. That's a roller delayed blowback battle rifle chambered in 7.62x51 (308). It always had a tendency to damage commercial brass ammunition, but not the milsurp stuff. Then last summer it was failing to eject spent brass. I installed the largest rollers I could find to increase head spacing, which seemed to fix the issue for now.
Last week I took the CETME to the local smith with spare rollers and new bolt. I think the head spacing may still be too tight, but I'll let the professional do his thing. He said that it should not have an issue cleanly ejecting commertial brass.
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