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The relief angle is stoned onto the face of the sear & runs from about middle of the face toward the back (hammer side). The suggested angle is 45 degrees but I go shallower with mine. The net result is less engement surface of the sear face in contact with the hammer hooks. It makes the pull more crisp with no creep. If your hammer hooks are cut to .020" and the sear face is relieved about half way, you end up with about .010" of actual contact between the two parts. A good reason to honestly consider your skill level before attempting this. Full auto 1911s are NOT fun. If you are comfortable with it, give it a try.
 
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