Modify Irregular-Pitch Spring for MOD24 / APS-2 (M190 / 9mm)

Modify Irregular-Pitch Spring for MOD24 / APS-2 (M190 / 9mm) M130 Power Upgrade Spring Designed to change the FPS of the rifle being upgraded Suitable For Modify MOD24 Bolt Action Rifle/ APS-2 Series Airsoft Rifle Length: 240mm