Luger 1906/29
 

Is it possibe to add a trigger stop on Luger?

One can add a "trigger stop" to any common pistol.
Lugers do not have "target" triggers; but most find them adequate.
A strategically placed lump of epoxy will suffice.

My suggestion to you is to experiment with your pistol as much as you wish, but don't expect luger collectors to have done the same or encourage it.

The adage of "it is what it is " comes to mind.:)