Some would argue the “new” shelf to be less safe as the sear can slip off it compared to the older hook design which actually captures the sear.It isn't an accident waiting to happen but it was to prevent it from firing if dropped on the muzzle there's was also changes to the hammer pre80 and they added a quarter #### shelf to prevent the hammer from having enough inertia to fire if your thumb slips while thumbing the hammer down.
Another picture.....
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