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View larger WE R-Series R9 MOS GBB gas magazine in black is an airsoft gas magazine with a capacity of 23 BBs and a durable metal body. It offers reliable feeding, a redesigned gas route, and minimal gas leakage. The magazine is designed for WE R-Series R9 MOS GBB airsoft pistols.

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The R-Series R9 MOS gas magazine is specifically designed for WE R9 MOS pistols, providing perfect compatibility, reliable BB feeding, and consistent performance. Thanks to its high-quality construction and redesigned gas route, it retains gas efficiently while maintaining stable muzzle velocity with every shot. The metal body gives the magazine realistic weight and excellent durability against drops and rough handling. Its 23 BB capacity is ideal for training sessions and fast-paced airsoft games. The fill valve is easily accessible, and the entire system is designed for medium-pressure Green Gas, ensuring straightforward operation without complicated tuning.
Regularly lubricate the seals with silicone oil and avoid storing the magazine completely empty. Keeping a small amount of gas inside is recommended.
In cold weather, Red Gas can theoretically be used because gas expansion is reduced at lower temperatures. However, we do not recommend it, as stronger gases accelerate wear and may damage both the magazine seals and the pistol's internal moving parts.
No. WE R-Series MOS magazines use a redesigned gas route instead of the standard flat profile, making them incompatible with the nozzle used in the AAP-01, RAVEN / VORSK EU-Series, and standard R9 / R3 pistols. In addition, the magazine is too short for full-size models such as the AAP-01, R7 / R8, and EU7 / EU8.
| Variants | R9 MOS |
| Color | Black |
| Magazine material | Metal |
| High-cap / Mid-cap | Mid-cap |
| Magazine capacity | 23 |
| Blowback | YES |