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Thread: Upper Receiver Recessed Cut

  1. #1
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    Upper Receiver Recessed Cut

    What is the purpose of the recessed cut in upper receivers?
    9019C032-3B80-455D-9B5D-9F053C68422F.jpg
    Big brother is watching...and listening.

  2. #2
    Join Date
    Oct 2016
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    It is a clearance cut for an autosear,

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