I asked around everywhere and I cannot get that longer 57mm spring to my hands. I would order from McMasterCar but I would need the spring details (OD, wire OD, material, load). The spec is different between the 57mm and 52mm not just the length, not the same stiffness.
these sites have them. you probably want to double check if they are 57mm..
https://www.huma-air.com/FX-Impact-Tuning-Hammer-Spring
https://spares.bagnallandkirkwood.co.uk/product/part-c7-fx-impact-hammerspring/
Yes I saw these springs but non of them saying what is a length.
Here is the same spring you're looking for, used in many FX guns. This would be the 57mm version. (or whatever the earlier impact had before the PP)
https://spares.bagnallandkirkwood.co.uk/product/part-d4-fx-hammerspring-11500/
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