Just received and installed mine last night. Same issue with "teeth" from the machining and other machining marks, but otherwise pretty nice. You can hear it sawing it's way in and out of the receiver, but not sure if it's actually an issue.
On my MATEN with the front pivot pin in, I can't close the receiver with the BCG in by just rotating the upper. I need to fully remove upper and slide it in from the forward position. Anyone else have this issue?
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