Sear modification to prevent interference with the disconnector
This is from a 40+ year old article in the American Rifleman detailing what was done at Springfield Armory (the Army one) to build guns for the National Matches:

Note how this method leaves the outer portions of the legs intact to avoid (I think) what Tuner mentioned.
Regards
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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