Ino is actually very well made with many steel parts. Out of the box I also had many problems, but once fixed, it runs excellent. On mine, I changed:
1. Hop-up chamber
2. RA-Tech NPAS/Steel Bolt
3. Fixed upper/lower receiver wobble/movement (搖動).
All lower receiver parts/buffer parts original and are very well made. Mine was 2nd generation. I heard 1st generation was worse.
I heard the 2009 version is the same thing except RA-Tech replaced some parts and tuned it. But the price is $$$$$$$$$$!!!!! HKD8500-9XXX?