I have an Apex Action Enhancement Kit on my Gen3 17. This consists of a new Gen3 factory trigger bar with the Apex trigger shoe, an Apex ultimate safety firing pin block plunger, and an Apex performance connector. This kit is a direct drop-in replacement of the Glock factory polymer trigger, safety plunger and connector and gives a smooth trigger pull with reduced travel, reduced reset, a crisp break and about a 1lb. reduction in trigger pull weight.
On my Gen3 19 I installed the factory polymer trigger takeoff from my 17, but I have the Apex firing pin block plunger and the Apex performance connector. This is a nice reliable carry trigger for less than $40 bucks for the Apex parts.
On both guns, the Apex parts work great with the stock Glock striker spring, trigger return spring, and firing pin block plunger spring, I didn’t want to replace any of these stock springs.