I agree with SwampYankee. It's not about ignoring the other 3 if you make sure that it's really, really, really not loaded.... it's about the other 3 being AUTOMATIC if you UNDERSTAND #1.
The fact that I check, double check and then triple check that the gun is, in fact, NOT loaded, doesn't change the way I handle the gun afterwords, except to the extent that if I thought it might be loaded I wouldn't actually pull the trigger to begin disassembly, for example.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.