Sucks that you're having problems, but why all the drama? **** happens; plunk down a few bucks for a new hammer from a known-good source and drive on.
I once got a Rock River LPK that had the detent spring missing from inside the base of the hammer (the spring puts tension on the trigger pin, keeping it in place). Rather than call RRA to complain, or try to track the LPK back to whatever dealer I got it from, I just ordered a hammer from PK Firearms and everything was good.
If I ordered a parts kit with a missing/defective part...I'd probably call and get a replacement part. I'd be unhappy if I didn't get what I paid for