The Garand slamfired enough that the military replaced the rare round firing pin with a lighter "scalloped" version around 1942. The Italians added a firing pin spring on their box magazine versions.
And thus the problem was corrected...and with a non-inertial firing pin.
I've shot both rifles extensively, and I've never had a slam-fire. I've experienced the occasional double when squeezing the trigger slowly...very slowly...and I learned to make it happen almost on demand. What was actually occurring was a bump fire. I was pulling the trigger twice without realizing it.
The intertial type with the pin being shorter than its channel and spring loaded doesn't present the same problem. If the pistol slam fires, there are other issues within the fire control group.
I stand by my statement.