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View larger EPeS WE M4 / AR15 GBBR magazine body seal kit is a replacement O-ring set designed to repair leaking WE AR-Series GBBR gas magazines (M4, M16, SCAR-L, Masada ACR and HK416). Made from high-quality NBR rubber with a hardness of 70 ShA, these seals help restore magazine airtightness, consistent performance and reliable gas retention. The package contains enough seals for 5 magazines.

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: WE
WE00563-BK
WE Gas Magazine V3 for GBBR M4/16 Rifles with a capacity of 30 rounds, Stanag (Black) type. This new generation V3 also offers improved construction and more reliable performance with stable output without fluctuation thanks to the enhanced Output valve and redesigned Gas Route. The magazine is intended for Green Gas.
: WE
WE00563-TAN
WE Gas Magazine V3 for GBBR M4/16 Rifles with a capacity of 30 rounds, Stanag (Tan) type. This new generation V3 also offers improved construction and more reliable performance with stable output without fluctuation thanks to the enhanced Output valve and redesigned Gas Route. The magazine is intended for Green Gas.
: WE
WE00564
WE Short Gas Magazine V3 for GBBR M4/16 Rifles with a capacity of 20 rounds, VN (Black) type. This new generation V3 also offers improved construction and more reliable performance with stable output without fluctuation thanks to the enhanced Output valve and redesigned Gas Route. The magazine is intended for Green Gas.
: WE
WE00565-TAN
WE Gas Magazine PolyMAG V3 for GBBR M4/16 Rifles with a capacity of 30 rounds, Pmag (Tan) type. This new generation V3 also offers improved construction and more reliable performance with stable output without fluctuation thanks to the enhanced Output valve and redesigned Gas Route. The magazine is intended for Green Gas.
: WE
WE00565-BK
WE Gas Magazine PolyMAG V3 for GBBR M4/16 Rifles with a capacity of 30 rounds, Pmag (Black) type. This new generation V3 also offers improved construction and more reliable performance with stable output without fluctuation thanks to the enhanced Output valve and redesigned Gas Route. The magazine is intended for Green Gas.
The EPeS seal kit for WE M4 GBBR magazines provides a simple and cost-effective solution for repairing magazines that have started leaking or have lost their original seal. The kit includes O-rings measuring 26 × 1.5 mm and 4 × 2 mm. They are manufactured from high-quality NBR rubber with a hardness of 70 ShA, offering long service life, good resistance to common airsoft gases and reliable sealing between magazine body sections. One package contains enough seals to service 5 magazines, making it suitable not only for individual users but also for teams operating multiple magazines. These seals are not compatible with magazines from other rifle platforms.
Helps eliminate gas leaks between magazine body components.
70 ShA rubber ensures long service life and reliable sealing performance.
The package includes enough O-rings to service five magazines.
Designed for WE AR-Series GBBR magazines using 26 × 1.5 mm and 4 × 2 mm seals.
An ideal maintenance part for routine servicing of gas magazines.
In most cases, yes. Worn or damaged seals are the most common cause of gas leaks between magazine body sections.
Yes, we recommend applying a small amount of silicone oil during installation. This improves sealing performance and extends seal lifespan.
| Variants | WE M4 / AR-Series GBBR |
| Color | Black |