With my 97B I had to use an M85 spring to get it to shoot below 350 fps.
That thing is so efficient that the spring I use outside (shooting at 380-385 fps) is a spring that used to shoot at 300 fps in a regular AEG (my old MP5K).
Morale of the story : get much weaker springs that you should normally and it will do the trick.
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Team N.A.P.K.I.N.S ( Ninjas And Pirates Kommando Infiltration Night-ops Specialists)
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