Ring,
If you don't mind me asking, what type of lower are you using and who's parts kit. I've only seen this happen on one rifle before. The lower was a CD and the parts kit was from Colt. The pins would actually slip when the lower was turned on its side without the hammer or trigger installed.


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and I saw exactly 1 that had a problem with the pins walking. The solution was after ensuring the receiver holes were still true I replaced the FCG and it's associated pins. Problem solved. 
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