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AR15.COM
1/9/2021 5:56:55 PM EDT
Why were there standard and deep socket 51t mounts made?
Creator of the most viewed EE thread in ARFCOM history.

https://www.ar15.com/forums/General/-ARCHIVED-THREAD-Weird-EE-Read-post-count/5-2100843/?page=1
1/9/2021 6:53:41 PM EDT
[Last Edit: Chowser][Edited] [#1]
Some barrels required deep sockets. I think those with barely any shoulder?

But good luck getting a response. AAC is dead.
2/8/2021 2:31:47 PM EDT
[#2]
I think the deep socket indexes off of the crown and the regular one indexes off the shoulder.

I have both types but it has been so long since I used my aac can I can’t remember
3/21/2021 8:36:51 AM EDT
[#3]
I was curious about this several years ago - see their response in this thread, it should help:
Deep socket mounts

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