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Hi Dennis, Yes, the RISE Armament RA-140 Super Sporting Trigger is compatible with the FX-9, as it is designed to fit various AR-style platforms. From RA FAQ - "Is the RAVE 140 compatable with AR-15 9mm Pistols? Yes, all our triggers are compatible with AR-15 pistols but we recommend the RAVE PCC for the pistol caliber cartridges." https://www.budsgunshop.com/product_info.php/products_id/144902/rise+rave+pcc+trg+curved , Stay safe & have a great day!