.....My Father's Smith & Wesson 357 mag Combat Model 19, for example, does not have the safety mentioned. It was made in the 60s and re-worked for competition to boot......
....I happen to know the model 19 fairly well and know for certain that it came from the factory with the block in place.....
.....As Shinook suggested, it appears yours may have been modified, damaged or incorrectly re-assembled.......
Guys, yes, my post clearly mentioned its modification. Its also has a trigger job. It is my Father's, not mine. He was a competitive pistol shooter and instructor years back.
The point I was making was that the OP could not tell the difference and a revolver might be vulnerable. The Glock will not be. I have heard of people lightening the Glock trigger, but never removing the firing pin safety.
I find the full pull on the Glock for each round to be much safer than semi-autos that have a heavy double action pull and then an extraordinarily light single action pull after that, ie the P226. While the first will keep you from shooting yourself in the foot, the rest are near hair triggers.
If you want a pistol with a heavy pull, try the Walther PPK. I have an original, made in Germany. Must be at least 20 lbs on double action and still 10 on single after that. James Bond must have had some grip.