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Polarstar UGS CO2 Insert - 12g Milspec

[69116 / PS-UGS-CIN-12GM]
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Featuring an integral expansion chamber, anti-siphon system, 5 micron filter, and check valve, this CO2 insert prevents liquid CO2 from entering the regulator regardless of the rifle's or air rig's orientation. This advanced technology also prevents gases from escaping the expansion chamber during cartridge replacement, allowing for several full-power shots even after the CO2 cartridge has been removed.

With an average of approximately 180 shots based on an F2 running at 1.5J w/ .28g through a 6.05x380mm barrel, this CO2 insert ensures optimal performance and efficiency. Additionally, it boasts standard ASA threads on all inserts, allowing for use with standard HPA regulators/air rigs. Please note that the UGS requires the addition of a Milspec Rail (sold separately) before inserts can be used. Designed to the same diameter as a Milspec buffer tube, this CO2 insert is the perfect upgrade for any airsoft enthusiast looking to improve their game. Please note that 12g CO2 cartridges are not included.


  • integral expansion chamber
  • anti-siphon system
  • 5 micron filter and check valve
  • approximately 180 shots
  • Standard ASA threads on all inserts
  • Made to the same diameter as a Milspec buffer tube
  • UGS requires addition of Milspec Rail (sold separately) before inserts can be used

Manufacturer: PolarStar
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