So, I recently bought a Gen 2 G19 from a dealer online. The pistol was in phenomenal shape for being 24 years old (checked the serial number). The sights had been changed out for Trijicon HDs (no complaint there). The rear slide plate has been changed as well (No complaint there either. Although I'm not a huge of nautical stars lol.) once I got the slide, I noticed pretty quickly that the previous owner had also changed out the firing pin safety to one of the aftermarket titanium ones. I'm just curious as to what that may add to functionality of the pistol. I've read both good and bad about them. Some have said that they wear out after a thousand rounds. Some have said they've fired a good 3 to 4 thousand rounds without issue. Again, I just want to know why that would be viewed as a necessary modification for what is already a phenomenal firearm. Any info is greatly appreciated. Thanks, guys!