Description of the Automatic Pistol, Caliber .45, Model of 1911: With Rules for Management, Memoranda of Trajectory, and Description of Ammunition. E-book. Formato PDF United States Ordnance Department   -  Forgotten Books, 2017  - 

In the plates the numbers correspond with those given in the list of component parts and In the description that follows. The three principal parts of the pistol are the receiver barrel and slide (3)