I am a fairly new shooter, i have shot my cousins glock 19 and was really accurate able to hit a coffee can on most shots from 15 yards. Anyways i bought an used glock 22 because it was at too good a price to pass up. I am getting really good groups just way left of point of aim. Its not just me my cousin has taken his model 19 and shot directly to point of aim, then shot my model 22 aiming for the same place and it hits about 5 inches left. My gun has the oem adjustable rear sight, white outline on adjustable base and the windage screw won't turn hardly any.