BTDT several times ...
don't waste your time working with Chinese parts.
Start with USGI trigger, hammer, and NEW trigger and hammer pins, follow Kuhnausen's book and keep the chinese parts uncut as spares in case you screw up.
Just a tip ... if you go too far, you can slip a piece of emory paper between the trigger and the little piece pinned to the trigger . Polish there a few minutes at a time to firm up engagement a bit.
NOTE: don't try to go below 4.5 lbs with the stock parts ... otherwise it may looks like it works, but the rifle may double or triple when NOT held tightly against the shoulder when fired.
[;{)
LAZ 1