FPS FPS ergal ball bearing spring guide for MARUI M4 SRE
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FPS ergal ball bearing spring guide for gear box MARUI M4 SRE next gen (GM4S).
Upgrade your plastic spring guide to the FPS ergal ball bearing spring guide for gear box MARUI M4 SRE next gen.
The shape of the rim makes it compatible with most of the springs today on the market. It increases the speed of the ball by 2/3 meters per second.
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