Since green gas is propane, some users opt for propane instead. You can purchase a fill valve that has a reservoir for storing silicone oil. These reservoirs will automatically inject the correct amount of silicone oil when filling your airsoft weapons.
One side effect some users do not expect when using propane instead of green gas is the smell. Propane is mixed with ethyl mercaptan to create a scent that safely warns people of propane leaks. The added silicone oil and the elimination of this odor are why green gas costs more than propane.
Although there are just a few minor differences between green gas and propane, they function the same. Green gas and propane have the same pressure and will both perform the same for any scenario. However, other types of green gas exist that vary in pressure. Red gas is the same as green gas but adds Ethane into the mixture. Red gas offers an approximately 30% higher Bar than green gas.
This increased pressure can be useful if your green gas weapon needs to shoot at a higher velocity. However, the most significant advantage is not just this increased pressure but also the increased pressure at colder temperatures. Since gas is impacted by ambient temperature, green gas gradually becomes weaker as temperatures drop.
Due to this need for higher pressure at lower temperatures, black gas was also created. Like red gas, it mixes Ethane with propane and rests at a higher pressure.
Black gas is a step up from red gas, almost doubling the pressure that green gas uses. When shooting an airsoft gun with black gas and an ambient temperature of 10 degrees Celsius, it will shoot with similar velocity to green gas at an ambient temperature of 30 degrees Celsius.
Using either red gas or black gas has its uses in colder climates or guns needing higher pressure. It is important to note that not all guns are designed to handle these higher pressures. A pistol designed to shoot under 350 feet per second may suffer damage or even break when higher pressure is used.
If you are unsure if your airsoft gun can handle the higher pressure and are not shooting in cold weather, it is best to stick with green gas.
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