Found another 4516-1 in my own (magazine hunting) travels today. Tags says $500 and it's a consignment gun so who knows what the owner might take (or if he might stand firm)? It's not in perfect "as-new" shape (comes with two magazines, no box) but all stainless 3rd Gens do clean up pretty nice.

Do I need another 4516-1 when there are so many other 3rd Gen models that I still don't own?

That's the $500 question!