Kraken Warning.
 

Hey, These things get awful piston head seals... Mine does, and so does everyone else's that I've talked to.

A new piston head is in order for all Kraken owners.

As I understand that the aftermath ak is a rebranded cyma cm028,then it stands to reason that the internals like the piston ......etc are not of the same qualtiy of the TM ,ics......etc , I would use the ak till it gives in then upgrade or do the deed now and upgrade.

As I am lucky I can buy wholesale , if my cyma guns go down I just replace it with a new AK or just upgrade cheaply . Its the best of both worlds.......;)

how much do i need to spend to change the piston head

Thats dependant on which brand you want and where you get it from.
Id like to say anywhere from 8-30 dollars. Without shipping.

of course it's not the same quality as a TM gun....that's why it's so much less expensive