The Glock trigger housing, or the Timney, red anodized sear housing?
If its the Glock trigger housing then your guy probably torqued the retaining screw down too much.
If its the Timny sear housing...DERP? How? lol.
I have five of these triggers, all in gen 5 guns.
They have all been 100% reliable albeit 100% varied in trigger feel.
On some of my older guns with slide to frame slop, there is a pronounced hitch as the trigger bar rolls over the firing pin block plunger. During dry fire you notice this, during live fire you dont.
My G34.5 was my primary training gun. The Timney in that gun has 10K+nds on it without cleaning and the original light weight trigger return spring. Truthfully, I lost count on the ammo so who know's where its really sitting. That gun is a filthy mess of carbon and oil. Zero issues.
I have noticed that these don't play nice with some slide stops. The fit between the trigger bar and the slide stop can do two things.
1. It can retard the reset.
2. It can degrade trigger feel.
I went back to OEM stops to alleviate this issue.
Would I carry one of these triggers? Based upon my personal findings, yes IF I had to which I don't.