I do not have the cannon. I ask if my idea will work ?

How do you need to make plenum chamber ? ( mechanism , plunger , spring ) ? Can you draw ?

Will this work ? my idea

Hello
I need help because I do not know how the mechanism inside?
Please help make the image looks like exactly the mechanism , the compression chamber .
The valve of the fire extinguisher cylinder of CO2 and the CO2
Regards