I would say that if you put in a full CO2 cartridge and shoot half of it up, and leave it for 2-4 days it would be fine and you would still have 1/4 the cartridge left. Anything more than that would make the slow leak deplete it.
Needs to be serviced
No! No! No!
No. It is there for a reason. Leave it.
The HK 416 Gas Blowback airsoft rifle measures 31.7 inches with buttstock collapsed and 34.8 inches extended.
10-15 Seconds 5 second bursts
Not as long as you don't forget how to put it back together and it doesn't get dusty or rusty.
An air-soft gun that is powered by CO2 or green or red gas instead of a spring or a battery.
Of course it can.
No, it is green gas.
It is a gas and can be used to propel projectiles.