Upper receiver question

URGILOVERR

Private
Minuteman
Mar 6, 2023
86
14
USA
What is this cut out for above the gas tube hole ?
6C75AEE8-F199-437D-815C-E344DCE35554.jpeg
 
AR Stoner has something similar on some of their uppers that mates with a hole on their handgaurds for a alignment pin, a good idea in my opinion.
 
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If you Google "wedge lock" there are hand guards that use a pin to prevent rotation.

If I was a betting man I would say the pin goes in a corresponding hole on the hand guard and the other end goes in that notch.
 

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