Figures of JF-17 are as false as Gripen.
Just a basic calculation and you will understand it.
Empty weight: 6,586 kg
Fuel capacity: 2,330 kg
Max takeoff weight: 12,700 kg
Empty weight + Fuel = 8916 kg
Add additional 300 kg weight and your get 9.2 tons weight without weapons.
12.7 - 9.2 =...