This spring is specifically designed to function with the Desert Tech SRS-A1 sniper rifle
Spring Velocity: (Dependent on barrel length)
16" / 420 mm Barrel: 453 FPS
22" / 578mm Barrel: 523 FPS
26" / 680mm Barrel: 529 FPS
Compatibility: Silverback Airsoft Desert Tech SRS-A1
Manufacturer: Silverback Airsoft