So that my morning's discussion elsewhere won't be completely in vain...
A lot of Glock aftermarket triggers get sold by the manufacturer claiming "It has a stock (or polished/plated) Glock trigger bar" with the unstated presumption that this leaves all the factory Glock safeties intact.
But that isn't the case.
Now, here are two examples of quality triggers in my own guns that are both using factory Glock trigger bars. Both Glocks are fitted with a Striker Control Device from Tau Development Group. I have used both guns in classes and would carry either one.
SSVi Tyr trigger in it. The gun is "cocked" (hold your emails about how Glocks are really only about 7/8th's cocked, Glock nerds.) Note how the Striker Control Device lies flush with the slide as intended.
Overwatch Precision in it*. Notice how the SCD stands just ever slightly proud of the slide. This is because, despite having a stock trigger bar, the shoe of the TAC provides just enough pretravel that the tail of the trigger bar is lightly contacting the SCD.
Now, the ZEV Fulcrum trigger, which I'm not providing a link to because it's garbage and if you use it you should feel bad, also uses a "factory trigger bar". But if I put the Fulcrum in one of these guns, which I'm not doing right now because I'm in a hurry, the SCD would be pushed WAY out. And if you looked up the magwell with the Fulcrum in the gun, you'd see that the trigger bar was so far to the rear, even with the trigger at rest, that the firing pin safety was disengaged.
With that trigger in your gun, your gun is not drop safe. And I don't mean "not drop safe" in the "if you drop it on a hard enough surface at just the right angle from the right height while holding your mouth right" sense, I mean that the gun will discharge with surprisingly little jarring.
I feel bad for ever having that trigger in a gun. I didn't know. Now I do. And so do you.
Fulcrum trigger: Not even once.
*That trigger was sent to me for free for T&E. I liked it enough that I paid retail for a second one.