I do own Kraken myself, I has to tell you that it perform very well for its price, Not equal to G&G, TM, and other brand. But you does get what you pay for. Just left to professional gun tech if you want to make change. My brother did try to make change on his kraken, and it is broken.
But remember, good quality guns mean you can use guns for more longer and save up more money on repair. Even better if it can use TM parts. I do think Aftermath Kraken can use TM parts.
my english is bad. however, It don't make up different on your ignorance.