Features:
Functional bolt catch
Adjustable front and rear sights
Reinforced polymer receiver
Removable folding stock
Ambidextrous charging knobs
Semi and full auto select fire
Type 3 adjustable hop-up
Gas operated recoil blow back
FPS Range: 310-330
Infornmation:
Model: VZ61
Materials: Steel, Zine Alloy, Nylon, Rubber
Length: 273-517mm
Weight:1270g (2.8 pounds)
Power Source: GBB
Action: Semi/Auto
Ammo Type: 6mm airsoft BBs
Ammo Capacity: 20 round magazine
FPS: 400
Bunker Tech Upgrades
Maple leaf gbb 6.02mm Inner Barrel
Maple leaf  High Accuracy Hop-up Bucking- Internal Parts Adjust
All function checks, to avoid common tolerance issues.
BB weight for optimal performance: 0.36 gram 
PS:
40rd Magazine for KWA VZ-61 Skorpio