Hi, I just installed the DAT trigger on my glock 19. (from glockkraft/Overwatch)
Function check is fine. The trigger feels really amazing. It uses a Gen3 trigger bar with some NP3 protection.
I have read numerous reports on people changing out the trigger bar in a gen 4 for a gen 3. Has anyone had a malfunction by doing so? I have never seen a confirmed report. There are very minor difference between the trigger bar with one being that little "dimple" on the side of the trigger bar on the gen 4 (for friction?)
The bump or dimple on the firing pin safety arm on ALL Gen4 TWTBs (trigger with trigger bar) maintains proper alignment of the FP safety arm under the FP safety when the magazine catch has been relocated to the right side. That configuration tends to twist the top of the magazine (especially longer magazines) into the left side of the trigger bar, which can result in a bumpless FP safety arm misaligning under the FP safety. If your G19 has the magazine catch on the normal left side, the bump does nothing and it doesn't matter if a Gen3 or Gen4 TWTB is used.
An unrelated change Glock made to the Gen4 TWTB is an improved attachment point for the coil trigger spring hook on the TWTB and TMH (trigger mechanism housing) that makes spring hook failure less likely. Glock subsequently incorporated that same improvement to the coil trigger spring attachment points on the TWTB and TMH for new Gen3 pistols and parts as well.
FWIW, Glocks in 10mm, .45ACP, and .45GAP have always had that bump on the TWTB...for more than 25 years now. The TWTB for these models is the same, regardless of generation.
The bump or dimple on the firing pin safety arm on ALL Gen4 TWTBs (trigger with trigger bar) maintains proper alignment of the FP safety arm under the FP safety when the magazine catch has been relocated to the right side. That configuration tends to twist the top of the magazine (especially longer magazines) into the left side of the trigger bar, which can result in a bumpless FP safety arm misaligning under the FP safety. If your G19 has the magazine catch on the normal left side, the bump does nothing and it doesn't matter if a Gen3 or Gen4 TWTB is used.
An unrelated change Glock made to the Gen4 TWTB is an improved attachment point for the coil trigger spring hook on the TWTB and TMH (trigger mechanism housing) that makes spring hook failure less likely. Glock subsequently incorporated that same improvement to the coil trigger spring attachment points on the TWTB and TMH for new Gen3 pistols and parts as well.
FWIW, Glocks in 10mm, .45ACP, and .45GAP have always had that bump on the TWTB...for more than 25 years now. The TWTB for these models is the same, regardless of generation.
Question...If the bump is only for the case of a left handed magazine release, then why has glock been putting them into the larger caliber guns for years?
I think that you left out another reason that glock put them in all gen4 guns. It's because there has been a number of failures in all gens due to the trigger bar protrusion not fully depressing the firing pin safety because the protrusion rode too close to the slide. This is the same reason for the redesigned firing pin safety in the g43/42. I had this exact failure in my G26.3. Glock technician, Isaac, told me that this, along with the left hand mag release issue, is why glocktalk included the bump on gen 4.
I left something out. When you add a gen3 bar to a gen4, you are opening yourself up to a failure like I described above. I know it's "cool" to not like the bump, but it's there to increase reliability. All Glocks from gen5 on will have the redesigned firing pin safety like the g43 for this exact reason.
I've got a Gen 3 trigger bar with Apex trigger in my G23 G4. Many rounds, no issues.
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