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NEED HELP !!! - new spring low fps


Lukeberto01
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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, 

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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 ?

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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.

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