Kutter,
That 522 I've got has the odd safety feature you're talking about. I had another 522 that did as well, a strange idea but nothing really too inconvenient.
Destry
I've never did come accross another example other than the one I had, and I was always looking at 520's,,still do.
I have to admit I did fumble with the mechanism a few times. You get so used to operating a pump gun slide w/o doing anything else when the 'hammer is down'.
Hang fires,,long hang fires,,must have been a problem back then or at least perceived to be.