The Wilson Combat AR Ambidextrous Charging Handles are not compatible with AR9's. There are many 9mm charging handles on the market like the one linked below.
https://www.opticsplanet.com/precision-reflex-9mm-gas-buster-reg-charging-handle.html
if your ar9 is a standard ar15 style pcc yes it will work. I dint understand why some of the optics planet agents give wrong information.
Compatible with all forged and billet AR-15 size receivers that accept a standard USGI charging handle