Hi Charlie,
And welcome to the forum!
As George mentioned, that should be a "Sear Safety". It was specified by police organizations and some others and installed (and often removed from) a relatively small number of Lugers.
The forum here appreciates pictures. Use the full "Add Reply" function and you'll see a place to add attachments toward the bottom of the dialog.
Marc
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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