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.......