Having seen the updated photos of the dove tail. I must agree that it could be an upgrade installation or repair. That being said, however, we see what appears to be an original set of lighter stake marks on the front of the dovetail (similar to milspec flip staking) and a heavy punch on the rear. Could the punch have been done later to the new milspec when the original staking started to fail before the gun even left the factory? We will never know.