THAT IS A GUNSMITH MADE SIGHT RIB. I'VE BEEN SHOOTING PPC FOR 30 YEARS. NEVER SAW ONE LIKE THAT WITH THE WINGED FRONT SIGHT AND A MODEL 52 REAR SIGHT. I HAVE SEEN SEVERAL CUSTOM LIKE THAT WITH THE 52 REAR SIGHT WITH A SINGLE FRONT SIGHT POST WITHOUT THE WINGS OVER THE YEARS. JP