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1911 80% Tactical Machining Build, Part 7: Sear & Hammer Pin Holes

Using Tactical Machining's 1911 80% jig to cut the hammer and sear pin holes.

    Quickly learn how to drill the sea and hammer pin holes for your 80% 1911 project.


    Keep the jig on like you did for the slide cutting and barrel seating.  You’ll just remove it from the vise and lay it flat.  Remember to bubble level it and clamp it down!  Disclaimer again.


    Choose whichever bit size first.  Here I went with the 4mm hammer pin hole.  I’m going to drill just through one side.

    1911 Hammer Pin Hole Jig
    1911 Hammer Pin Hole Jig

    TOO EASY after what you’ve been through.  Now finish up the other three holes.

    1911 80% Hammer and Sear Pin Holes
    1911 80% Hammer and Sear Pin Holes

    Next Lesson

    Part 1: Intro (Finding the 80%)

    Part 2: Tools

    Part 3: Parts List

    Part 4: Basic Fitting

    Part 5: Cutting the Slide Rail

    Part 6: Barrel Seating

    Part 7: Hammer & Sear Pin Holes

    Part 8: Fitting the Slide

    Part 9: Assembly & Fitting

    Part 10: GunKote Application

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    6 Leave a Reply

    • Commenter Avatar
      rover dog grooming

      Great site you have got here.. It's hard to find high quality writing like
      yours these days. I seriously appreciate individuals like you!
      Take care!!

      February 14, 2020 12:47 pm
      • Commenter Avatar
        David, PPT Editor

        :D Thanks for the kind words!

        February 14, 2020 1:47 pm
    • Commenter Avatar

      Hello, I enjoy reading all of your article. I wanted to write a little comment to support you.

      July 30, 2015 8:44 pm
      • Commenter Avatar
        Eric Hung

        Thanks so much!!!

        July 31, 2015 2:01 pm
    • Commenter Avatar

      Thanks for documenting all of this! It has been a great help as I do mine. I have a question about the sear and hammer holes and pins. I drilled the holes and they work great as far as the pins going through. The pins have a lip on them, should that lip be flush with the frame, or does the lip sit on the frame? Thanks!

      October 17, 2014 8:29 am
      • Commenter Avatar
        Eric Hung

        Thanks for your question! The lips should sit flush on the side where you have the thumb safety. That way the pins won't fall out. I actually had the pins going in the wrong way until my smith told me if should go in the other way. I ended up using the rounded bit from the burr set used in the installation of the plunger tube to make the pins sit flush.

        October 18, 2014 5:04 am
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