Glock 17 Gen4 (T.Marui) 200% Recoil Spring Set

This upgrading 200% recoil spring set fits Glock 17 Gen4.  It is specially made for heavy slide and/or hard-kick recoil action Glock 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. All products are for airsoft only. They are not made for real steel firearms.