There is also the difference in function. All of the 1911 pistols (less the next generation 1911's) are single action only pistols, Kimbers included. They take a different operational approach than your typical double action auto pistol. A 1911 must be cocked prior to firing the first round. But with a double action auto you can pick it up and fire the weapon as soon as you release the safety. It does not need to be cocked prior to firing.