Polarstar UGS CO2 Insert 33g Milspec, Black

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The Polarstar UGS CO2 Insert 33g Milspec is a high-quality, essential accessory for airsoft enthusiasts who use the UGS (Universal Gas Stock) system from PolarStar. This insert is designed to seamlessly integrate with your existing UGS system, enhancing your airsoft experience with reliable and consistent gas delivery.

Crafted with precision, the insert is made from a combination of aluminum and brass, ensuring durability and longevity. This robust construction is ideal for airsoft players who demand equipment that can withstand the rigors of intense gameplay. The black finish not only adds a sleek, professional look to your airsoft gear but also provides an extra layer of protection against wear and tear.

The 33g CO2 capacity of this insert is perfect for players who are looking for a balance between size and performance. It provides a sufficient amount of gas to keep you in the game longer, reducing the need for frequent reloads. The compatibility with the PolarStar UGS system means you can trust this insert to work flawlessly with your equipment, providing a hassle-free and efficient experience.

Whether you're a seasoned airsoft player or new to the sport, the Polarstar UGS CO2 Insert 33g Milspec is an excellent choice for enhancing your airsoft rifle's performance. Its ease of use, combined with the quality construction from PolarStar, makes it a valuable addition to any airsoft player's arsenal. With this CO2 insert, you can focus more on your strategy and less on your equipment, giving you an edge in any airsoft battle.


  • Features an integral expansion chamber, anti-siphon system, 5-micron filter, and check valve
  • Prevents liquid CO2 from entering the regulator in any orientation
  • Conserves CO2 during "combat reloads" and allows full-power shots even without the CO2 cartridge
  • Averages approximately 180 shots with an F2 at 1.5J using .28g through a 6.05x380mm barrel
  • Standard ASA threads for compatibility with HPA regulators/air rigs
  • Requires Milspec Rail (sold separately) for UGS insert usage
  • Same diameter as a Milspec buffer tube
  • Does not include CO2 cartridges
UGS Universal Gas Stock system from PolarStar
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