Cross-section diagram of U.S. Army <a href="https://en.wikipedia.org/wiki/M1911_pistol" class="extiw" title="w:M1911 pistol">Colt Model 1911 semi-automatic pistol</a> ("Automatic Pistol, Caliber .45, Model of 1911") as shown in official Army description for the pistol. The numbered parts are as follows (omitted numbers are for parts not labeled in the diagram):
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<div><ol style="list-style-type:none"><li>1. Receiver</li><li>2. Barrel</li><li>3. Slide</li><li>8. Slide stop</li><li>9. Rear sight</li><li>10. Front sight</li><li>11. Link</li><li>12. Link pin</li><li>13. Barrel bushing</li><li>14. Recoil spring</li><li>15. Recoil-spring guide</li><li>16. Plug</li><li>20. Firing pin</li><li>21. Firing-pin spring</li><li>22. Firing-pin stop</li><li>23. Hammer</li><li>24. Hammer pin</li><li>25. Hammer strut</li><li>26. Hammer-strut pin</li><li>27. Mainspring</li><li>28. Mainspring cap</li><li>30. Sear</li><li>31. Sear spring</li><li>32. Sear pin</li><li>33. Disconnector</li><li>34. Trigger</li><li>35. Grip safety</li><li>36. Safety lock</li><li>37. Mainspring housing</li><li>38. Housing pin</li><li>39. Housing-pin retainer</li><li>40. Lanyard loop</li><li>41. Lanyard-loop pin</li><li>48. Magazine catch</li><li>50. Magazine-catch lock</li><li>51. Stocks, right and left</li><li>52. Stock screws (4)</li><li>53. Screw bushings (4)</li></ol></div>
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<a href="https://en.wikipedia.org/wiki/Ordnance_Corps_(United_States_Army)" class="extiw" title="w:Ordnance Corps (United States Army)">U.S. Army Ordnance Department</a>
<a href="//archive.org/details/descriptionofaut00unitrich" class="extiw" title="iarchive:descriptionofaut00unitrich">Internet Archive identifier</a>