http://www.airguns.citymax.com/catalog/item/251488/7718385.htm

Exactly as the above kit but with the 32 coil Euro Tarantula spring instead of the E3650.

http://www.airguns.citymax.com/catalog/item/251488/43410.htm 

This spring dictates a perfect barrel with a choke and tight fitting pellets and a gun with perfect tube tolerances. If not it will be harsh and as if its dry firing because it is stout. It will get great power and longevity in perfect guns. Lower power in bad guns and subject the spring to failure as bad tolerances destroy springs and seals. ( Dry Firing Effect)