Originally Posted by Mark75H
Isn't this usually related to the amount of sear engagement and therefore a safety concern to make too short?
You are thinking correct on the bolt action style direct-contact sear but on the Marlin semi-autos, there is additional "creep" or gaps on both ends of the disconnector besides the sear ledge that you refer to. The disconnector is a linkage between the trigger and the sear.
This pre-travel does not bother me because I squeeze the pre-travel out until I feel the sear drag. This is easily felt in the KAT trigger when you know you are at the tripping point.
One cannot eliminate the entire pre-travel on the disconnector because it needs slight clearance to wobble back and reset.