Are we talking about the same thing?
Some peep sights are added on top of the rear bridge. What makes me say this is your question
Fallschirmjaeger "
do people just remove them to mount scopes and then lose them?" I have no experience with them on the ZKK, but yes I suppose some folks could misplace them after removal...
HOWEVER, if we are talking about the factory pop up peep sight, I am with
Clodo Ferreira, I think that it is about impossible for it to fall off the rifle, or to be misplaced in the field because,
of course, it does not need to be removed from the rifle to install a scope.
Because I am a "belt AND suspender" kind of a guy when it comes to rifles in the field (this is probably coming from having seen how issue rifles are treated in the military...) I remember gluing the two adjustment screws (Loctite Blue) after zeroing the peep on my first ZKK, that had a factory pop up peep sight, just to be on the extra safe side.
This is easy to do: count the turns of the front elevation screw when you remove it and reinsert it after degreasing the thread and dipping the screw generously in blue loctite; and use the index notches on the support piece to keep the peep in the same place when you do the same for the rear azimuth screw.
I have personally never heard of any case of the factory peep being lost
in the field. The pop up support is impossible to loose unless the axis is worn out, in which case you should pin a new hardened steel one in, and the above method guaranties that the most vulnerable part, the peep itself, will not detach, and the adjustment screws will not loosen.
