G Series 17 Gen4 TM 200% Recoil Spring Set

This upgrading 200% recoil spring set fits G Series 17 Gen4.  

It is specially made for heavy slide and/or hard-kick recoil action G Series with faster recoil action.  

This spring set has outstanding durability and reliability because they are made of supreme Japan steel piano wires.  

These springs replace the original Marui springs: GBB9-16 and GBB9-17.