Re: Chinese Daily Photos, Videos & News of 2013!!!
its been modified that's for sure. The Eotech sight, Flashlight and fore grip were added post production. it's likely Chinese. 
My frist guess was type 85 
 
but if you stop oogiling the girl and look at the weapons the structure is wrong. but I think I am on the right track. type 85 was the end of the line so working back I end up at type79 
Type	Submachine gun
Place of origin	 People's Republic of China
Service history
In service	1979- present
Used by	People's Republic of China
Production history
Designer	208 Institute of the Ministry of Ordnance Industry
Designed	1970-1979
Manufacturer	China North Industries Corporation
and China South (Norinco)
Produced	1981—present
Number built	+290,000
Specifications
Weight	1.75 kg
Length	740 mm stock extended/470mm stock closed
Barrel length	250 mm
Cartridge	7.62x25 mm Tokarev
Action	Gas-Operated, Rotating bolt
Rate of fire	500 rounds/min
Muzzle velocity	515 m/s
Effective range	200 m
Feed system	20-round box magazine
Sights	Rear sight notch
sorry equation but its a sub powered subgun.