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The CO2 configuration comes with a different rail that allows it to accept our 12g or 33g CO2 Inserts which makes it possible to use traditional Milspec buttstocks. Your choice of a 12g or 33g CO2 insert is included with the CO2 models. The 33g CO2 models accept threaded CO2 cartridges while the 12g CO2 models use the standard 12g cartridges commonly used for Gel blasters.
One can configure the same UGS for the use of either the 2.000" HPA tanks or Milspec CO2 inserts by purchasing the different UGS Stock Railsseparately.
With the PolarStar UGS™ (Universal Gas Stock) you can now get the performance advantage of a HPA system without needing to be tethered to a remote air rig and still retain the likeness and function of a traditional adjustable AR-15 stock. It can be used with any of the PolarStar cylinder conversion kits such as the F2™, F1™, JACK™ or Kythera™ and is compact enough that it can also be used with other similar HPA cylinder systems on the market.