PDI APS 110 Spring - 0.9Joules (13mm diameter & 11mm inner diameter)

PDI APS 110 Spring - 0.9Joules (13mm diameter & 11mm inner diameter) Silicon Chromium Steel Construction Upgrade Spring 110% Power up increased power of 0.9J (approx 310fps@ 0.2g BB ) Supreme Quality Airsoft Electric Gun Spring 13mm diameter & 11mm inner diameter You will get a stable muzzle velocity when install this spring Suitable for Maruzen APS2 & Type 96 Airsoft Sniper Rifle Mad in Japan