Gas Airsoft rifles are much like other types of gas Airsoft guns. They use compressed gas to shoot BBs and come in both blowback and non-blowback form. However, in the world of Airsoft, gas rifles are the most fun to shoot. This is because blowback rifles simulate the recoil effect you only find in real rifles. There is a distinct sense of realism when you have the stock of the gun pushing against your shoulder as you unleash hundreds of rounds per minute on your target.