I've asked this before, but it seems to have been lost. How do you know if the BCG is moving too hard? What is a "lock back" check?
I agree that ejection pattern is not a reliable test of the gas system. However, if the gun is functioning, i.e. cycling reliably, why mess with the gas system at all?
Also, I agree that the gas system can only be fixed by adjusting the gas system. Changing buffers and springs is not the answer.
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