[John Sabato]

You can look up the parts by name in the technical section of our website. The upper receiver left side contains the sear bar, held in place by a flat spring. The front of the sear has a springloaded button that is the disconnector.

You gun configuration = police use because the top of your sideplate has a rectangular notch where the pin that dropped into the sear to prevent it's movement when the sideplate was removed. There is also a small hole in the projection on the upper receiver that covers the sear bar where the sear safety was riveted. The entire sear safety has been removed. The use of the safety is dubious and it was only used on Police service Lugers. If you can find the parts and have them installed it would "complete" your Luger, but as long as you know that a chambered round could be discharged by pressing inward on the front of the sear with the upper receiver removed from the grip frame. So a forum search for "sear safety" and you will find photos of the install parts...