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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
Note the Prowin hop-up Unit showed on the pictures is for demo only and not included in the package.
