[Hectic]

If It uses VSR10 internals and it's slam firing (pull bolt back try to push forward and it flies forward with the spring tension) you need 3 parts (two items) a steel sear set (first and seccond sear) and a piston. The contact point between the seccond sear and piston wears quickly on this type of trigger setup at anything above 300fps, even with steel sears and piston they wear, I actually broke mine last weekend so I need a new sear set (this is a 500fps setup with 6 or 7 seasons of use)
I think I stated this before but here goes again.
Start with again good base.
replace the sears, piston, spring guide, hop unit and inner barrel. That is an entry leven build.
you should also replace the cylinder, cylinder head.
then you should assemble it all. Shim stuff to make stuff line up perfect, such as hop to receiver inner to outer outer and receiver to stock etc...
you can repair what you have and continue to build on it but in the end you'll find the best way IMHO is to start with a good base then build from there, why? Cause a TM with a set of sears and piston will out shoot an upgraded to the tits clone any day. Literally my tm with the stock 300fps spring out shot my 500 fps built on a well/tsd/what ever re branded clone. Once I put the 500 fps spring in it it was night and day till the sear went so I dropped all my parts in.

In closing when you originally asked about bolt actions those if us who (firstly are patient enough to answer questions that have been answered hundreds of times on this forum alone) and with the knowledge to advise you took the time to advise you to the best of our knowledge the best course of action to avoid throwing answer way money, like many of us have in the past. You chose to not listen. If you go back a read what was said to you you will see that we have advised you on what to buy, wht to upgrade and in most cases why.
well now you know why sears and a piston were the first things on the list. Right next to a hop rubber and inner barrel, followed closely by a hop unit and barrel spacers.
or you could just grab a full zero trigger and piston set instead of sears and piston. Also keep in mind laylax and pdi yes! (First fire makes good sears)
Off brand clone shit no!