There aren't that many aftermarket internals for it yet, that part is true. But it seems to be quite the solid and reliable gun, without the need for upgrading and aftermarket parts. All of the externals can be replaced with real steel or some AEG parts as well. It looks like AEG inner and outer barrels can be used with minor modification.
Founder of Capital Airsoft in Edmonton
Out of the Game 04/22/16