The newbie (me) was recently renting various 9mm pistols, and then on a separate occasion various .45 pistols. For the .45's, I shot a HK45, then a Kimber, and finally a Springfield XDm. I noticed that I was shooting consistently low with the HK45, and attributed it to perhaps the gun not being right for me since I was shooting far better with the Kimber and the XDm. I then found the attached graphic on the HKPRO forums. So, newbie question. How much variance is there in the expected aiming method across the manufacturers? Is it simply read the manual? I think I'll have to explicitly ask when renting each type of pistol.