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Colt/Umarex M4 Adjustment Pin

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  • #1
    Terry's
    Junior Member
    • Nov 2013
    • 1

    Colt/Umarex M4 Adjustment Pin

    What is the purpose/function of the adjustment pin (part #36) and spring (part #52)???
    Tags: None
    • #2
      MCHK
      CGN/CGSSA Contributor
      CGN Contributor
      • Jun 2010
      • 78
      Puts the barrel in tension against the slide housing (bolt carrier).

        Comment

        • #3
          mark501w
          Senior Member
          • Apr 2011
          • 1699
          Bolt stop.

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