falken_gt4 Posted March 6, 2019 Share Posted March 6, 2019 Hi, I have a self build M4 using RetroArms CNC Gearbox with quick release spring guide. I am struggling to find a spring to give me 320-325fps to be safe for the 330fps limit at the site I go to. I have the following springs and FPSs using the same rifle. Guarder SP85 - 290fps Guarder SP90 - 305fps Guarder SP100 - 345fps Element M95 - 355fps Element M105 - 375fps SHS M90 - 330fps - winner!! SHS M100 - 390fps Can someone recommend me a spring that is in between a Guarder SP90 and SP100, I bought the Element M95 hoping it would be in between but it was more powerful lol. My air setup setup is; TM Type 0 Cylinder SHS 7 Metal Tooth Piston SHS Double O Ring Cylinder Head SHS O Ring Nozzle Element Vented Piston Head Madbull Hopup with Lonex Soft 50 Hopup Vanaras 6.03mm 363mm Inner Barrel Cheers Andy Link to comment Share on other sites More sharing options...
Supporters Sitting Duck Posted March 7, 2019 Supporters Share Posted March 7, 2019 surprised about the element springs tbh apart from chopping a spring you could try leaving a spring compressed overnight to force it to fade take an crappy piston, drop a long bolt through it, add strong spring, large robust washer & nut tighten the nut n bolt to compress spring into old piston leave over night & retest might be worth a shot - excuse the pun to save opening up box to remove bearing/piston spacer what you can try is rotating the spring if you are near that figure on irregular springs the tightly wound end goes at back but if you rotate spring so tight coils are up front in piston you should gain an extra 10fps aprox I found obviously on regular springs there is no real difference if you rotate them one thing I would do is ensure your hop is fully dialed in for the bb's you are using be a bitch if you get it bang on, then lose 10~15fps tweaking the hop to get the lift perfect Link to comment Share on other sites More sharing options...
falken_gt4 Posted March 8, 2019 Author Share Posted March 8, 2019 Cheers for the reply, I will tune the hop up and see if i can compress the SP100 Guarder spring. Failing that has anyone done a spring comparison that includes the ones I have and others so I could maybe make an educated guess? Cheers Andy Link to comment Share on other sites More sharing options...
falken_gt4 Posted March 17, 2019 Author Share Posted March 17, 2019 Found a winner - SHS M90 gave a consistant 325-330fps SHS M100 gave a consistant 390fps!! Have updated the results above, might be useful for a comparison between the springs (rather than the figures themselves) as they were all shot from the same rifle with no changes other than the spring. Cheers Andy Link to comment Share on other sites More sharing options...
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