Green gas is basically no more than propane. Many gas airsoft rifles and pistols use green gas as their propellant. These airsoft guns are the most powerful suite of airsoft guns. Although propane is flammable, it is usually no more dangerous than many common hairsprays and refrigerants. These green gas canisters come in aerosol cans, just like hairspray.
Green gas is often tagged as a haz mat (hazardous material) when it comes to shipping and delivery. Therefore many stores do not stock it. However, it can be found online, and a small canister might sell for around $20-$40. But again, the shipping will be higher, so make sure that you buy some other airsoft products, to help balance out the costs. This may seem costly, but one small can of green gas can last for many, many refills of your airsoft gun. If you want cheap airsoft guns, you probably aren’t interested in green gas guns. Green gas airsoft guns are the high end airsoft guns, and you will be paying more for them. If you want cheap airsoft guns, consider going with spring powered airsoft guns or electric airsoft guns.
Green gas gives the most lifelike action of any of the airsoft products available to date. Especially when combined with a blowback gun, the firing experience will have a loud sound, as well as a kick when the slide or hammer is engaged. Often this will be combined with an automatic reloading of the airsoft gun. Thus, you can have semi-automatic or fully automatic gas airsoft pistols and guns.
It is important to note that while green gas is basically propane, green gas includes some additives that help keep the seals and other parts of the airsoft gun in good working order. So if you are thinking of using your own propane instead of certified green gas, it’s ok, just know that you’ll need to grease up the moving parts of your airsoft gun.
So when it comes to having mil sims or law enforcement simulations, using green gas with gas airsoft guns is the most lifelike combination. These airsoft guns normally have just as much weight as the real thing, use full metal, are high powered, and when used with heavier BBS (like .2g or .25g) can be extremely accurate, even at longer ranges. So if realism is your fancy, you will want to go with green gas and gas powered airsoft guns.
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That’s what it appeared like to me as well. Using the recent BATFE disaster regarding the WE M4 Gas Blowbacks, that is only more bad marketing for Airsoft.