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