All of my 9mm 3rd Gens, except my 5906 shoot better with 124 or 147gr rounds. I think that's how they were designed because at that time 147gr was the standard LE round.
They all shoot significantly low with 115gr.
They all shoot significantly low with 115gr.
I like shooting both the 6904 & 6906. My accuracy is better with 124gn & 147gn ammo.