Manufacturer: PDI
Inner Diameter: 11mm
Outer Diameter: 13mm
Spring Velocity: 370 FPS / 450 FPS / 520 FPS (on 0.20g BBs)
Compatibility: For all Tokyo Marui, JG BAR-10, WELL VSR-10, MB-03, MB-07, G-Spec, M24, M28, AGM L96, and other compatible bolt action sniper rifles with VSR-10 compatible internals
Material: High Grade Chrome Silicon Steel
NOTE: End result FPS may vary based on parts used and condition