AR4 MK2 is released now, so I'm lowering my asking price of this MK1 kit from $900 to $700. This includes everything you need to build an AR4 MK1 except for the frame (3D printed or aluminum).
As far as I can tell, these motors are compatible with the MK2 design, they will just be less performant because they don't have the latest and greatest gearboxes.
Reach out to my email matas.lauzadis@gmail.com with any questions.
Thanks,
Matas