Description:
Will fit APS-2 / Type 96 / SR-2 / M24 / M40A1 / M40XB
Length : 250mm around.
Outer Diameter: 13mm
Inner Diameter: 11mm ( please use the 9mm spring guide)
Note: In PDI test, VSR-10 Pro Sniper, Precision Cylinder Set HD, 05 Inner Barrel 430 & 0.2g BB. When you install this spring , your gun will get 600fps.