Quoting information from SGAmmo:
"2016 or 2017 manufacture based on observed headstamps. 50 round box of 9mm Luger 147 Grain Bonded Hollow Point Winchester Ranger Ammo… Winchester Ranger Sku number Z Q4392 ammunition is the FBI substitute load for the Law enforcement load # RA9B, which is to say it is the same ammo as RA9B just with the government contract Sku number Q4392. "
Brian