I got a 2020 made G19 Gen. 4 to match my carry pistol made in 2013. The 2020 model had erratic ejection so I installed the Gen. 5 G26 ejector. Ejects great now. I also put this ejector in a couple of older Gen. 3s and improved them greatly. I would try the Gen.5 G26 ejector before any other fixes.