Back story: Purchased used Gen 5 g19. Previous owner had already swapped out the OEM trigger group and connector for an APEX (102-111) but had given me the OEM stuff. Have put about 1000 rounds through it since with the APEX and LOVE the way it feels. I have several (a bunch) of Gen2's and Gen3's (19's and 17's) that have stock triggers. Does anyone know if the Gen 5 trigger and dot connector are backward compatible? Have a couple of Gen 2 g19's that I might swap it into if the GEN 5 OEM will work. I saw MikeM's post on connectors and infer from that the dot connector is likely backward compatible. So my question is more about the trigger and trigger bar. (And, I really have no interest in swapping back out the new GEN 5 APEX for the old GEN 5 OEM. And yes, I have read all of the pertinent posts on same.) Besides, I spoke to the APEX gunsmiths who confirmed that they have no evidence that the APEX triggers are compatible with GEN 2's. And their site confirms that this particular APEX trigger is NOT compatible with GEN3 or GEN4. so using the APEX in one of my other guns is not doable. Thanks for any insights....and please be kind.