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See the attached picture to see what an intact hammer profile should look like.
1 - indicates the primary sear notch. This is what the sear locks against to keep the hammer retracted back fully
2 - indicates the intermediate sear notch. I never fully figured out the reason or purpose as to the existence of this feature - I've only noticed that if this feature is worn down you can a) manually de-cock the gun and b) the gun can full-auto temporarily
(PS - if you're looking to modify the hammer to allow a manual de-cock, there's actually a different part that needs to be filed down)
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