Do the externally selectable triggers have a unique trigger blade?
Can a P4 trigger blade be swapped into an externally selectable trigger group?
Just curious and don't have an externally selectable trigger group to take apart and play with.
But you can get adjustable trigger blades for that trigger. Go to the vendor section and look up Marcello Giuliani (decimamas 54). Or just click on the threads in the window at the bottom of this page. He makes extremely high quality replacement parts for Perazzi triggers.