Some cheap guns' internals are pretty tough. My first AEG was a Double Eagle AK47 I got last spring. I fired at least 20000 rounds out of it, mostly in long, full auto bursts. The gearbox still works great. The gun fell and the stock broke off, so it's not really useable now, but internally, it still works fine.
Now, it doesn't perform anywhere near like the Kraken does in terms of velocity, but it does show that even cheap internals can work well. My brand new TM M4 blew out its gears after less than 10000 rounds.
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