Cyma ak74u

Kinger555

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Quick question my mates got a cyma ak74u cm035 advertised at 330fps when we went out the other day it was 269 on the chrono why would that be??

 
Was a local shop, it was advertised at 330fps was just wondering if it's normal,to be 269 or if it was a fault

 
What weight bbs were being used when it chronos low?

280fps is about right for .28 running 330 on .2

 
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