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Well it seems that i must have not charged my barrerie enough.
Any ways for those who will order a mad Bull spring you woud compre them to systema spring in terms of FPS.
My m100 did give me 360 FPS (m4 s with spring, bushing and a madBull tight bore of 363mm)
m110 shoud be around 380 fps
m120 shoud be around 390 fps
m130 shoud be around 400 plus fps
All this based on the result of a m100.
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