A PX4 9mm sub was my first firearm in a "real" caliber after years of nothing but .22LR, and briefly my first carry gun. Like others, I found myself shooting low-left with it, so I spent the money on the Beretta adjustable sights, despite not-being suited to concealed carry. In terms of accuracy, the new sights were an improvement, but I found the gun itself to be a little too chunky for IWB carry. Calling it a subcompact seems to me to be a bit misleading. Yes, it's smaller than its compact and full-sized brethren, but still hefty.