This is a Wilson Combat known as the Bullet Proof, model 416-45.
The Bullet Proof firing pin is a simple drop-in retrofit for shooters who want the toughest part available in their hard use gun. This part is a drop-in part for Series 70 or Series 80 style 1911 designs and for guns with a standard .45 ACP USGI/Colt diameter (.093") firing pin.
Features:
Drop-in Design
Improved Ignition
Standard .45 ACP/USGI 1911