I did some gunsmithing on mine - got the pull weight down quite a bit but ran into issues with the plunger not depressing and disengaging the trigger.
Fixed that issue. Now the trigger pull is way better. I bent the trigger bar spring on the leg going to the trigger bar and the additional angle seems to have reduced pull effort (break remains the same).
I still think someone needs to come out with a proper spring.... the pull weight shouldn't be anywhere near what it is on this gun.