Looking into one of my assembled lowers, I see the polished face of the trigger, the rounded bottom of the hammer (where the J-clip goes in), and the disconnector. Given that the polished face is ... polished, that piece doesn't seem to be the cause of a gritty trigger.
So is the culprit the rounded bottom of the hammer, which is unpolished, grinding against the polished face of the trigger?
Is it the disconnector?
Something else?
I'm just trying to increase my knowledge. Thanks in advance.


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