Polarstar UGS CO2 Insert 33g Milspec, Black

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This Polarstar UGS CO2 Insert 33g Milspec is a prime, top-notch, and important accessory designed for all airsoft enthusiasts using the UGS (Universal Gas Stock) system from PolarStar. It allows the user to have a perfect airsoft experience, as it delivers gas in a reliable and consistent way.

Constructed from aluminum and brass materials, this insert is extremely well made to provide durability and long-life performance. Its sturdy construction makes it perfect for airsofters who play hard and need their kit tough. Plus, this black color finish gives your airsoft gear a professional, sleek look, allowing you to improve its visual appeal and receive extra protection from wear and tear.

At the same time, its 33g CO2 capacity is perfect for a player who needs a balance of size and performance. It holds enough gas to keep you in the game for a long duration without the need to reload now and then. It is compatible with the PolarStar UGS system, which will keep working with your gear, ensuring a seamless experience without any hiccups.

The Polarstar UGS CO2 Insert 33g Milspec is a choice for an experienced airsoft player or someone new to the sport and looking for a way to boost the performance of their airsoft rifle. Easy to use and added with quality construction from PolarStar, this accessory will be a valued addition to the arsenal of any airsoft enthusiast. This CO2 insert lets you 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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