The Guarder Airtight Rubber is an upgrade part for Tokyo Marui MWS series GBBR magazines, designed to improve sealing and overall system performance.
It is a gasket made from NBR70° silicone rubber, engineered to provide a tighter seal compared to the stock component. Improved sealing results in more consistent gas flow, which translates into smoother operation and better overall efficiency.
The material is well suited for prolonged green gas use and maintains reliable performance across different temperature conditions.