How much should I screw the cylinder?/Parts(seals/orings) regulator valve P44

[10metershooterazores]

How much should I screw the cylinder! Until he doesn't go anymore and gets tight? It's an FWB P44?
And what parts is from the pressure reducer seals?
I choose to know the Price of this ones:
4.9.0002
6.2093.028(6x)
4.9.0015
4.9.0016
4.9.0017
0,20 dick)6.0988.009
0,30 dick 6.0988.008
0,35 dick)3.4.350 235
0,40 dick) 3.4.350.240
0,45 dick)3.4.350.245
0,50 dick) 6.0988.007
Thank you

[David M]

Screwing on the tank only opens the tank valve, so firmness has no part in pressure.
Screw the tank in to be hand firm only, the O rings do the sealing. This allows high pressure
into the pressure regulator and pre-charge chamber.
The pistol pressure is controlled by the spring pile in the pressure regulator, adjustable
only by gunsmith/factory (changing pile).
Pellet velocity is controlled by spring hammer strike on poppet valve.

[KDZ]

Agree with David - not too tight. Also the aluminum threads can gall, so I like to lube the threads (only) with a thin film of silicone grease