Ver.2 Spring Guides: For Marui compatible M4, G3, MP5, Mod5, M16,
Scar and compatible Ver.2 Gearbox series.
Marui P90 uses Ver.2 Spring Guides.
Ver.3 Spring Guides: For G36C, G36, MK36, AK and other Ver.3 Gearboxes.
Ver.4 Spring Guides: For Thompson Seris.
Echo1, JG and other China Clone P90 / E90 uses M14 Type
Spring Guides.
For other model specific spring guides, please refer to descriptions of
spring guides.
*Ball Bearing Spring Guides: With the new ball bearing design,
provides lower friction and smoother firing / rate of fire.