This is a Wilson Combat known as the Sear, model 314.
The sear is the heart of a fine trigger job. The Wilson Combat Deluxe Bullet Proof Sear is Precision Wire EDM cut from S-7 Tool Steel Bar Stock and heat treated for maximum hardness. Contact surfaces are ground to an ultra smooth 8 RMS finish.
Features:
Heat Treated for Maximum Hardness
Precision Wire EDM Cut
S-7 Tool Steel Bar Stock