The Franklin Armory BFSIII AK-C1 Trigger - Binary Firing System for AK Platforms will not work with the Charles Daly PAK 9.
yes, the 9mm option will fit, I have it in a Nak9 which is made in the same Romanian factory, same gun as the Pak9. The Pak9 is just has a just shorter barrel version. Works flawlessy in mine.
Nope, bought it, tried it, failed.