There is something wrong with my Kalibrgun.25, and I need help.

[928487381]

I request help. 
There is something wrong with my Kalibrgun.
I lost all the components as in the circled part in Fig.1.
Afterwards, I bought my friend’s second-hand components,
but now there is a major problem.
The initial speed of 1.645jsb on my Kalibrgun.25 is 756FTS, 
which is abnormal. 
I want to make my kalibrgun.25 reach 900FTS,
I want to know，
ignition valve spring，
complete parameters circled in Fig.2 are, 
and what the length is.

 

[2manyAirGunz]

 

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Hope that helps.

 

[guod123]

I believe that spring is held in place by the black plastic threaded button at the rear of the gun. Get yourself a power adjuster, it's a threaded cap with a screw that allows you to increase or degrease the pressure. On my .22 I've been able to detune the gun by about 175 fps less by backing off. If you don't go the adjuster just put back the black plug to the maximum depth. Georgia Airguns, Airguns of Arizona, Talon Tunes, or R&L could be sources of the power adjuster. Assuming ALL is put back correctly the regulator has to be set correctly also. If no reg tester is available start with the screw set to a 53 mm length.