as stated above i have know purchesd the tune kit for the gamo csi .22
im not sure what the spring is all it says is....
You get these Items- One of each.

E3650 Mainspring

Apex Small piston seal

Gamo Tesla piston seal

Moly

Heavy Tar.--whats this for??
and can anyone tell me if this spring is any good? and will it be ok to put in a sub12?
thanks