With 37s, it depends on the era. The 17 used a well designed (the one in my gun is on the fritz, but, it isn't hurting anything) interceptor that made it's way into later model 37s. There are also other designs used in the 37, and if you are up on it, you can look at the trigger group to see which one you have, or, don't have.
I've never even tried "slam firing" the single model 12 I own, as I have enough trouble hitting things when I'm using a gun the right way, and slam firing never seemed like the right way to me.
Maybe someone like Earnest Hemmingway needed that feature in Africa.
Best,
Ted
