NEED HELP !!! - new spring low fps

[Lukeberto01]

Hi everyone, my new gun the M4 SRT-03 spartac, I chronoed it and it was 410 FPS which is to powerful for a full auto rifle, so I bought a new spring and I was suppose to make the FPS 360 FPS but when I chromoed it it was 140 FPS please help ?? 

Thanks in advance, 

 

[Sitting Duck]

140 is pretty dire - bad air leak

the nozzle is not sealing against the hop if you just replaced the spring

most likely the nozzle is misaligned - gearbox tipping upwards

or hop unit not pushed firmly backwards to seal with nozzle when fired = air pissing out

who changed the spring ?

 

[Lukeberto01]

Me I changed it. 

 

[Hangtight]

Well, you've invalidated your warrantee. If it was shooting hot you should have asked the retailer to downgrade the spring to your preferred limit.

 

[Lukeberto01]

There was no retailer ner me. 

 

[Samurai]

Take it to someone who knows how to work on airsoft guns. It's not something one just magically knows how to do with a hammer.