Apart from the fact that I wonder how come you got a gun in the first place since this breaks ALL the rules here...
If you want us to diagnose a problem, you will have to tell us exactly WHAT was upgraded. What spring is in there, what else was done. If you got a heavyer spring and the fuse remained the same, then the 'pro' did not do a good job.
If your batteries are not charged/discharged properly, with a decent charger, you will have other problems.
If the mechbox was not tuned properly after the upgrades, it will cause friction and a loss in efficiency along with blown fuses.
If you suddenly increased the effort of the motor and of the electrical system on the original fuse, of course it will blow.
So tell us more, and I like many would love to know who sold you an AEG.
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