WILL THE PX4 TRIGGER JOB IN A BAG WORK IN MY SUBCOMPACT?

No, the PX4 TJIB will work in the PX4 Full-size and Compact ONLY since the Subcompact trigger group is smaller than the Full-Size/Compact. You can send your subcompact in for us to do a trigger job on the firearm itself. Our Trigger Bar, hammers and hammer springs will work. 

Not sure what to select for your options on the Trigger Job in a Bag for your PX4? Lucio is here to help you out!