This is a set of 2 power tuning springs for your FX Impact with Power Plenum and it consists of:
1x Valve Return Spring:
This slightly weaker valve return spring can be used on any FX Impact equipped with the genuine FX Power Plenum. This spring has a bit weaker power curve compared to the original valve return spring what will result in a bit longer valve opening time to get some more extra power out of your rifle.
It’s great when you want to tune your FX impact for slugs or hybrid slugs.
1x FX Impact Power Tune Hammer spring
This hammer spring has a bit more higher power curve compared to the MKI hammer spring what will give you more flexibility and power adjustment options when using the power wheel of your FX Impact.
It’s great when you want to tune your FX impact for slugs or hybrid slugs and we prefer to use this spring over the factory spring when you use the power plenum in the MKII