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20+ round Magazine for the HFC HG-189 model green gas gun. We recommend using a green gas adapter with silicon with this magazine sold at your better airsoft stores such as us 6mmz.com.  Green Gas is in fact Propane gas which is highly flammable and dangerous if you are unaware of its combustability.  This is why we recommend  airsoft-innovations green gas adapter for safety, and best value. Using the adapter will save you much money , and the refill tanks can be found at most any chain store, and some airsoft stores.  Be sure to use the silicon oil as recommended to keep the rubber seals properly conditioned.