Our cylinder conversion kits such as the F2 use the AEG's original
mechanical safety to block the trigger from depressing the trigger
microswitch just as it would have as an AEG. There isn't an electronic
safety on the switchboard so the mechanical safety lever must be
retained to have a functional safety.
If the safety is still in place, just double check that it was installed
correctly so that it can pivot up and block the trigger. Also, if you
happened to install an adjustable trigger and have it adjusted for a
very short pull, the trigger could be adjusted so far that the safety
lever will not have enough clearance to pass in front of the trigger.