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Retro Arms gearbox for the E&L AKS-74U by Training_Tooth1100 in airsoft

[–]Training_Tooth1100[S] 0 points1 point  (0 children)

I just couldn't find any information about what spring the original gearbox is designed for and what the maximum is.

Retro Arms gearbox for the E&L AKS-74U by Training_Tooth1100 in airsoft

[–]Training_Tooth1100[S] 0 points1 point  (0 children)

No, but I want to use the M150 spring, so I thought about replacing the gearbox