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Northeast CO2 magazine for the STEN GBB submachine gun offers a 32 BB capacity and stable performance even in cold weather. Designed for the Northeast STEN MK.2 and MK.5 GBB, it uses a standard 12 g CO2 cartridge. Compared to the Green Gas version, it reduces muzzle velocity by approximately 10 m/s (40 FPS), making it easier to meet CQB field limits while maintaining reliable operation.

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: ASG
CO2-1
ULTRAIR 12 g CO2 Cartridge by ASG in a silver finish. 1 piece per package. Contains 12 grams of compressed carbon dioxide (CO2). Designed for powerful gas pistols with metal slides and GBBR rifle magazines. Not recommended for use in pistols with plastic slides.
: ASG
CO2-SIL
ULTRAIR 12 g CO2 Cartridge with Silicone by ASG in a silver finish. 1 piece per pack. Contains 12 grams of compressed carbon dioxide (CO2) and silicone. Designed for maintenance of seals and internal parts of gas pistols and rifles. Not recommended for use in plastic slide pistols.
NORTH009
Northeast STEN MK.5 GBB SMG (v2026) is a highly realistic airsoft replica of the legendary British submachine gun, featuring a steel construction with genuine beech wood furniture. It offers an authentic gas blowback system, Semi and Full Auto firing modes, an adjustable hop-up, and compatibility with both Green Gas and CO2. The 2026 version introduces...
The Northeast CO2 magazine is designed for STEN MK.2 and STEN MK.5 GBB gas-powered airsoft submachine guns and provides an excellent alternative to the standard Green Gas magazine. It is powered by a 12 g CO2 cartridge housed inside the magazine, delivering consistent pressure and more reliable cycling, especially in colder weather. Low temperatures are one of the biggest challenges for traditional GBB systems, as gas pressure drops and both consistency and blowback performance decrease. The CO2 version significantly reduces these issues, allowing you to extend the operating season of your gas-powered airsoft gun. According to the manufacturer, it also produces approximately 10 m/s (40 FPS) lower muzzle velocity than the Green Gas magazine, which can be advantageous for meeting stricter CQB field limits. The magazine holds 32 BBs while maintaining the authentic dimensions, appearance, and handling characteristics of the original STEN submachine gun magazine.
The magazine uses a standard 12 g CO2 cartridge inserted directly into the magazine body. The cartridge is not included unless otherwise specified.
Yes. CO2 is generally less affected by low temperatures than conventional airsoft gases. This version therefore provides more consistent performance in cold weather and helps extend the usable season of your STEN GBB.
| Variants | CO2 |
| Color | Grey |
| Length | 240 (mm) |
| Weight (g) | 550 (g) |
| Magazine material | Metal |
| High-cap / Mid-cap | Mid-cap |
| Magazine capacity | 32 |
| Blowback | YES |