So its fixed now finally - and it was the air nozzle that was the problem.
thanks all for the help!

I WIN!
lol

hi i have echo1 scar l i put m90 spring it shot under 70 fps .clinder head & nozzle(no o ring) LEAKing. but know m120 it shots 398 it has good compresion do you think m110 will put me around 365 or less

Can you please clarify a bit?

the gun had air leak cylinder & air nozzle know with m120 shots 398fps .should i put m110 will it get me to 365 fps . are should i turn down the hop up

Your hopup should be adjusted for accuracy, it shouldn't be used as a means to reduce FPS.

What brand of spring are you using? Every manufacturer has a different FPS for their spring rating (the '100' in 'M100' doesn't actually mean it shoots 100m/s)

A systema M100 will get you around 360fps
A prometheus MS110 will get you around 380fps

im using modify sp120+ spring. i was thinking of putting modify sp110+ spring or a 100 ?????

I'll add to this list that my Modify S110+ has got as high as 408fps in my G36.

ThunderCactus is right, turn off your hopup when doing measurements.

i put a modify s100+ spring on a echo1-L got 354-360fps got spring from mach1 airsoft they have alot a good parts and guns there .they where very helpful