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Discussion Starter · #1 ·
First time post. I have searched a lot of threads on the site but have not found an answer to my specific problem. I would appreciate your expert input.

Building a 80% 1911 (416 SS Frame) and have some questions on drilling the sear and hammer pin holes. I will be using a mill with a DRO and indexing off the cross pin hole and using dimensions to the sear and hammer pins per Kuhnhausen 3rd addition.

1. I will use a center drill to locate pin centers but should I drill through with small pilot (1/16") and then follow with full size. Or just one shot full size and final ream.
2. Cobalt or Carbide drills (4 mm for hammer and #35 drill for sear)?
3. Final ream size for holes?
Thank you in advance for your help.
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