Had the same problem on my G&G M4 when Aegiis was changing the spring in it.
No BB's were coming out at all when shooting.
It was the tappet plate spring that wasn't placed. So the Piston wouldn't rock back and forth it would just stay there even though the spring was working fine.
Hooked the spring back up, plugged the battery on the mechbox and test fired and it was now going back and forth. Put everything back and voila!
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