The original, all-metal Airsoft propane adapter design. Premier propane adapters enable the use of propane in your airsoft gun as a cost-effective replacement for Green Gas. 100% American made, reliable & easy to use. Premier propane adapters enable the use of propane in your airsoft gun as a cost-effective replacement for Green Gas. This American made adapter is constructed out of precision CNC-machined aluminum and brass components and manufactured to CGA (Compressed Gas Association) standards for optimum reliability & durability. Premier propane adapters have a 20% longer filling connection to easily reach deep magazine fill valves. These adapters are fully assembled and ready for use, straight out of our factory here in Minnesota. Just add 5 drops of silicone lubricant (or 1/2 second spray) to the top of your propane cylinder, thread the adapter till hand-tight (be careful not to cross-thread), and you are ready for action. Standard 16.4 oz propane cylinders can be found at most camping, hardware, and outdoor goods stores. * NOTE: Follow manufacturers guidelines as provided in the instruction manual for safety and proper use and be sure your airsoft gun is propane compatible.