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On Labor Day weekend at the gun club in Merlin OR there is a charity fund raising machine gun shoot over the weekend - and you can shoot a wide variety of submachine guns and crew served weapons.
It's expensive but a lot of fun.
My favorite is the Mk 19!
I had never fired an Mg 42 until this event - very much like the M-60.
I suppose for pure (expensive) fun the Ma duece is right up there for me. It still takes a Man, firing short bursts, to keep it on target.
For the sport of competition, I love the 203!
you probably have a lot more access to the 'fun' than I do these days