The Benelli action has no similarity or relation to the Win 50 at all.
The Benelli is a modern day Sjogren shotgun. See Butler 'The American Shotgun' pp142.
Too bad the 50 was such a dud. They only sold about 200,000 of them (ibid). That's 6 for every Model 21, and they did that in about 5 years time.
The 59's cracked receivers frequently. The aluminum alloy frames we take for granted today took some development. Eventually engineers figured out how to stress the guns properly by putting steel and recoil buffers where needed on subsequent auto designs, notably the Italians. The 59 was a transition piece.
The 50 was a brilliant design in concept. The actual execution was only fair, but the guns sold well and were well liked.
I still shoot mine regularly.
By the way, the Model 11 was the way it was because Browning owned the patent on the 'operating handle' concept. If the Model 11 design is inherently unsafe is a matter of opinion. You can't fix stupid.
