Unfortunately this is not compatible with the Galil Ace.
Similar to the Arsenal firearms, it will most likely require significant modification to the trigger housing and the firearm, professional installation is required.
I know that the Galil trigger is slightly different than the traditional AK trigger, so it won't drop in as is. The question is can this be modified or altered to properly function in a Galil? That I don't know, and I would not recommend experimenting. I would definitely consult a competent gunsmith on this matter.
The Franklin Armory BFSIII AK-C1 Trigger - Binary Firing System for AK Platforms will not work in AK style shotguns.
The Franklin Armory BFSIII AK-C1 Trigger should work in a PSA AKV9. You will want the 9mm model which is Franklin Armory BFSIII AK-C1 Trigger model number 03-50002-BLK.
It is possible, I would double check with the manufacture.
It should be compatible, but due to the wide range of AK variants there is always the possibility that some minor fitment could be required.
This will not work with a modified trigger system.
Yes, it should be compatible.
It should be compatible.