I got to shoot my Plus lower with a 2.0 four inch upper today. The combo ran reliably and had no POI shift with the new lower. I have a mild preference for a 43X over a 48, but pretty strong preference for the four inch slide on the Shield. The four inch Shield defaults to a go fast mode for me if I don’t pay attention, which is different than with some other slim line pistols where I need to push. With the caveat that I don’t shoot irons much these days, this is the four inch slide on a Plus lower shooting an array of paper and steel.