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High quality professional HopUp rubber made of specially selected blend of silicone rubber. When correctly installed it will improve the tightness and BB's performance. Manufactured by Action Army company from Taiwan.
Dedicated to Marui standard replicas: VSR-10, Hi-Capa, Glock, PX4, FN5-7, P226, Detonics, M1911, MEU, SOCOM and similar.
Also fits WE GBB M4 Open Bolt replicas.
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support@red1airsoft.com if you need any help