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  • Description

    Those springs are harder than usual. Once the uppper receiver fitted, they will lock & tackle your hop-up unit on the front of the gearbox to ensure perfect seal & no movement during firing.

    Set of 2 springs:

    • 1 x spring central heavy force Spring for M4 AEG hop-up unit
    • 1 x Enhanced strong spring for M4 AEG hop-up unit
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