Unlike previous Glock models where triggers and trigger bars can be more or less switched between models of the same caliber and frame, Glock changed some of the design features, most prominently being the ambidextrous slide lock which therefore changes the shape of the trigger bar in the Gen 5, in addition changing the trigger housing. That means that previous trigger designs made for any of the generations beforehand will not work in the Gen 5. This applies to previous Apex triggers made for earlier Gen Glocks as well. Ever since the Gen 5 was publicly released, the company has been working on and testing the compatibility of various parts in addition to prototyping their own. One part that has fit from earlier Generations is their Apex Failure Resistant Extractor.
From the Press Release-
Over the last 30 days, the design team here at Apex has been prototyping and testing the new Gen 5 trigger design to ensure proper performance in the new model pistols. We are happy to report that the new trigger is already in production and we plan to officially release the Action Enhancement Trigger and Action Enhancement Kit for Gen 5 Glocks mid-October.
Similar to previous models from Apex, the company’s trigger will reduce over-travel and bring a shorter reset to the trigger. It will be able to be swapped between Glock 17 and 19 models as long as they are of the Gen 5 make. The company will be offering the trigger to customers on their website and perhaps in select dealers and stores come mid-October.
More about the Glock Gen 5 trigger here if you are interested-