I think you're thinking of the Micro or Mini uzi. The full size standard Uzi fires at 600RPM and is/was reliable and accurate/easy to maintain. That is what made it successful.
The Mini Uzi fires at 950RPM and the Micro Uzi fires at 1,200RPM.
TIL full sized uzi only shoot 600rpm. But for game balance, why is it the standard uzi instead of mini or micro? Security gets the mp7 which shoots significantly faster than the uzi, and the ARs perform just as well if not better at all ranges. So why ever pick the uzi, its not even free. I hope it gets some love in the next beta.