BFS 3 BINARY TRIGGER GOES RUNAWAY ON 9MM CARBINE

[bellavite1]

Hello guys.
I have a Franklin Armory BFS3 binary trigger, which has so far worked great on my AR pistol.
Because of ammo cost I decided to move it to a 9mm platform.
Just today I installed it on a Freedom Ordnance FX-9 9mm Carbine.
https://freedomordnance.com/fx-9-9mm-carbine/



When testing the safety, I discover that the BFS3 selector allowed just enough movement in the trigger for the hammer to drop.
Worse than that, pulling the trigger with the safety on on a live round resulted in my firearm going full auto in full runaway mode before stopping with the hammer dropped onto a live round that exhibited a light strike.
This happened consistently on both tests I ran.
It worked great in semi auto mode (Disconnector catching the hammer, one round at a time), It worked amazingly in Binary mode (!!!), but 10 years in jail are not something I look forward to, so I removed the trigger and re-installed the factory one.
The hammer provided with the weapon has actually extra sear engagement than a standard AR Hammer.

Supposedly the dimensions in the lower are standard AR, so much that it accepts all kind of AR parts, so, what gives?
Why does this happen only with the safety on (no runaway issue with the selector on semi or binary, works exactly as intended)?


HELP!