Hi Lance and welcome. No Sir, as recommended by Freedom Ordnance under ***Important- trigger*** on their website due to the (disconnector engagement built into the trigger) here: https://freedomordnance.com/product/fx-9/ ------------- Triggertech makes an FX-9 specific trigger upgrade: --- https://triggertech.com/products/fx-9-two-stage-trigger-adaptable ---------- Cheers, stay safe and enjoy!

Hi Lance, yes, but blowback designs are a lot harder on triggers and, even though any AR-type trigger can be installed in the FX-9, most won’t work very well or for very long.
The factory trigger is stiff and gritty, partly because it has more disconnector engagement built into it than a normal Mil-spec or aftermarket trigger group.
Stay safe & have a great day!