CP2 with external CO2 tank

To make this modification you need 4 parts:

1. CO2 adapter
2. hose
3. valve
4. CO2 bottle

CO2 adapter

You need adapter which makes possible to connect HP hose with 8mm quick connect to air rifle.

You can buy one in my shop. You screw it instead of CO2 12g cartridge and CO2 cartridge push screw.

HP hose with 8mm quick connect fitting

You need hose to connect air rifle adapter with CO2 tank. At first I bought less flexible hose with straight ends ... it works, but it was not nice to use.

You also need one female quick connect fitting with internal 1/8NPT thread (item name: "QD(F1-8NPT)") and replace it at hose end.
You can also buy double ended quick connect connector (item name: "Both End QD")

In photo below you can see hose with quick connector at both ends.

I decided to buy a second hose, more flexible with an angled end. This is much better choice then previous one. Ignore "T" connector and bleed valve - I use it in my PCP.

You also need one female quick connect fitting with internal 1/8NPT thread (item name: "QD(F1-8NPT)") and replace it at hose end.
You can also buy double ended quick connect connector (Item name: "Both End QD")

CO2 tank and valve

At the end, you need CO2 tank and valve. I have SodaStream in home, so I bought a valve which works with SodaStream tank.

For my SodaStream tank with Tr21-4 thread I use "3 hole Vent 3K QD" valve. Pressure meter is nice to monitor pressure inside the tank, but bleed valve is more important. You use it always before disconnecting the hose, to make it safely.