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Discussion Starter · #8 · (Edited)
It is where the retaining pin for the magazine disconnect goes.
Thanks Doby. When I look inside it seems like there is nothing in there but an empty hole. (?)

I take that back. If I shine a flashlight from the inside of the frame into the hole, I can see what appears to be the edge of a roll pin. It's really hard to get a fix on it. Then again, I could be hallucinating. :)
 

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The mag. diconnect is an additional peice of metal that "see-saws" on the retaining pin and a spring goes between the trigger bar and the mag. disconnect lever. The hole would be filled up with the retaining pin if you had the mag. disconnect installed.
 
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