This is exactly what we told you would happen in the
other thread (did you even read any of the replies?)
The best advice you can have right now is just write off the $120 and stop dumping money into this piece of shit. There's videos on YouTube of a guy who upgraded one as much as he could (investing more in upgrades than the actual price of the gun) and the end result was a spring action rifle that was barely shooting par with a stock, good quality AEG.
Seriously, just walk away and start over with a good platform.
Also, as previously pointed out, I don't know how much you want to upgrade this gun but it sounds like you're making something that won't be allowed on most fields. So unless you can come back and tell me "Yes, I know for certain that the people I play with will allow this velocity/power level" you'd better do your homework before going for such an upgrade.