SAT Variable Velocity Device Piston for AEG (VVD)

For Example

1.9 Joule Spring, 375mm Inner Barrel, 0.2g 6mm BBs. 
- Position 1: 450 FPS (full power) 
- Position 2: 340 FPS (20% drop )
- Position 3: 270 FPS (40% drop) 

1.3 Joule Spring, 375mm Inner Barrel, 0.2g 6mm BBs. 
- Position 1: 380 FPS (full power) 
- Position 2: 315 FPS (17% drop) 
- Position 3: 240 FPS (41% drop)