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

Leave a Reply

2 Comment threads
2 Thread replies
Most reacted comment
Hottest comment thread
3 Comment authors
Eric Hungbobopslosurfer Recent comment authors
newest oldest most voted
Notify of

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


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!

New to Guns ? Check out our beginners guns video course. Start Now