DH CO2 mod

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DEVILHUNTER CO2 mod:

The DH mod is a way to fill your GBBR magazines with CO2 from big tanks, without using the standard 12g cartridges. It has several advantadges:

-Increase the amount of CO2 that can be filled into the magazine, getting you way more shots per fill.

-Allows to use both CO2 and Green Gas magazines with very little modification. They still can work as intended.

-Gets you way cheaper CO2 than with 12g cartridges.

-Lets you refill the magazine in any moment, not having to wait to empty the cartridge or waste it's content.

DH mod does mainly apply to GHK rifle magazines, where the main internal body of the first magazines were the same between Green Gas and CO2 magazines. Current mags are built a little different but have been proven to work too.

 

One of the first things you should do if you want to run DH modded mags is to find a source for your CO2. I will explain the different options, as they very on initial investment and price per quantity.

-Soda stream tanks. This is the most common way, as it does not require high investment and is easy to get in many places. Sodastream is a company that produce machines to make your own carbonated drinks at home. They uses CO2 refillable tanks that we can use with the DH mod. But be carefull, there are two types of tanks, blue ones with threaded connection, and pink ones with a quick detach system, you want to get the blue ones. Tanks have a capacity of 410g (14.5oz) of CO2. Tanks are equiped with a pin valve (not the best option in my opinion, see they paintball tanks explanation), a TR21-4 thread with a front sealing gasket and a burst disk.

Full new bottles and refilled bottles (returning your spent one) can be bought at supermarkets, making them really easy to get in many places. Prices ranges from 15$-20$ for a refill to 25$-30$ for a new tank, which makes it the most expensive way (besides disposable cartridges) of getting CO2. Where I live, homemade carbonated drinks are not popular, so Sodastream tanks are not as easy to get. Furthermore, they were way more rare back in the day when I developed the mod, so I went other route to source my CO2 and I don't have direct experience with them. I have no idea who should we acknowledge the first use of Sodastream tanks, but I'm pretty sure it helped a lot popularizing the mod.

 

Paintball CO2 tanks.

Paintball CO2 tanks are another low investment and kinda easy way to get refills for your CO2. Even if you are going for the big industrial tank, you probably want to get some paintball ones to carry to the field and fill your mags. In paintball they use 2 types of tanks, aluminium and fiber. Fiber tanks are only used for HPA, rated up to 4500 PSI and lightweight, are really common on paintball but they are not the ones we are interested in. Aluminium tanks is our way to go. On paintball, they are used both with HPA and CO2, depending on the output valve they have threaded in. Tanks can be bought without the output valve, and the valve separatedly, and with them already installed. There are several sizes of tanks, from 4 to 24oz (113 to 680g), being the 12 (similar size to Sodastream tanks) and 20oz the most common ones. You can find tanks on paintball shops, there is also a big second hand market where you can find great deals. Prices new are similar to the Sodastream tanks. 

HPA valves have a pressure gauge to see how much pressure is still on the tank, and they have a pressure regulator to get it down to around 800 PSI. Neither of them are used in the DH mod, so either get pin or on/off valves.

Pin valves have a cylinder on it's center that is pressed when we screw something there, like the filling adapter. When pressed, the valve opens and let's the CO2 flow. This makes them simpler and cheap. But it has it's drawbacks too. When you screw your filling adapter and the valve opens, it will remain open until you unscrew your adapter. So if you have a small leak on your adapter, you should unscrew it to avoid loosing gas. Unfortunatelly, unscrewing the adapter under pressure is hard and can damage the o-ring on your tank. CO2, specially when in liquid phase, is quite hard to the o-ring material, as it difuses to it's inside. It does make o-ring to expand and gets easier to shear in the unscrewing process. The good point is that they will get their shape back in a few minutes. There is paintball stuff and right angle filling that let's you overcome this issue, more info on the adapters section.

On/Off valves have a switch that allows you to open and close them. They are a few bucks more expensive than pin valves. You can close the valve, then release the pressure on the filling adapter by pressing the nozzle, and unscrew them easily. Your o-ring will probably still be soaked in the CO2 but without the pressure it won't be so easy to damage.