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| HF | Hf | HFB320 |
| Hfr cell | HFC | HFS Plus |
| HFC134HFC134 (aka HFC134a) is the weaker of two propellants used in Airsoft gas guns. The other, HFC22, is considerably more powerful. A particularly confusing aspect of this is that both are known as "Green Gas", though HFC22 is more commonly know by that name |