the jam i have no idea
the 800 is a Diana Bandit or i should the Bandit is a 800
now the 800 is the PCP version of the CP2
here is the states we have the Chaser CO2 and Bandit PCP
the Bandit and the Chaser are the same except the power supple the grips and end cap
now the trigger can be reworked i have done much work to them so they have only 1.5mm of movement
but let's talk simple adjustments
there are 2 screws in the trigger and the front one is too short and back one is there but way to short
both screws are 3mm-.50 thread and if you were to get a couple 8mm and 10mm you can adjust the trigger
they say the trigger is 2 stage but it is not it is one stage
the front screw takes up trigger slack and pushes the sear down and is always in contact if you want a nicer trigger
the rear screw which they never made long enough, takes care of the fire of the pistol by pushing the sear down far enough that hammer moves forward
all the adjustments can be made at a table and you can watch what is doing what with the stock off
the pins in the trigger assembly like to fall out because they are undersized, i have replaced all of mine
now you will see a screw in the sear and that is a stop screw
these are just ideas and it is what i do but in reality what others do is none of my business