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For: Guarder SP85 AEG SpringProduct Information:
guarder spring are some of the most consistent in airsoft. cant tell you about fps b/c i used this in a upgrade build gun that had really good compression and used a lower spring to be indoor legal.
BEWARE if you are looking at this spring for the same reasons i was its a wear spring so with a 7.4v lipo and a semi high speed motor i was over rotating and getting two shots on semi throwing off my gearbox cycle and thus getting a lot of lock ups. so use an active braking mosfet.