The GLO-2303 trigger with trigger bar is listed by Glock Inc as fitting the G19,23,26,27,32,33 pistols. It features a serrated (grooved) trigger and is standard issue with these guns however it will also fit the G17,17L,22,24,31,34,35.
Do not use this trigger with early G19 pistols serial numbers pre EH
Looking for a GEN4 part? Glock lists GLO-4497 as the proper part.