Your only solution is to have a reputed guntech to swap the sring for you. Using a velocity reducer is not a good thing for CQB, as those things fail rather quickly and you will only know it when someone come to you with blood in their face asking you to chrony your gun... wich is very BAD.
Like mentionned before, fps use a 0.20g BB benchmark. We should use a joules terminology, but it's not very popular and well understood by the mass.
Vérificateur d'âge: Terrebonne