Originally Posted by
Robinson
Any time even a standard trigger job is done to a 1911, the fitment of the thumb safety should be checked carefully. The thumb safety interacts directly with the sear, so the sear engagement lug must be shaped properly and fitted to the sear. Fitting the thumb safety to the sear should be the last thing done when building or replacing the fire control components in a 1911. Not doing so can render the gun unsafe -- the safety may no longer keep the gun from firing when engaged, or worse.