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Inside the frame underneath part of the locking frame internal there is a what appears to be a roll pin sticking out don't know if it is seated correctly or needs a little push back into place? Couple of photos here trying to get a visual but not sure if they are any help.
Attachment 45613Attachment 45614Thanks Steve
Mine has it in the same place, not sure what it could be for other than some spring mechanism for the takedown lever detents. It's part of the insert and not the frame.
Gringop
Slide catch lever spring. Keeps tension on the slide catch lever so it doesn't pop up unless overpowered by the magazine follower and magazine spring.