Description

The Steyr Sport O-Ring 5.28 × 1.78 (Part No. 6390050) is an original replacement sealing component designed for Steyr precision air rifles. This O-ring is used within the pneumatic system of the rifle to ensure airtight sealing between internal mechanical components.

Manufactured to precise dimensional tolerances, the seal helps maintain stable compressed-air pressure, supporting the reliable function of valves and internal mechanisms. It is commonly included in Steyr factory sealing kits and spare-parts sets used for servicing rifles such as the LG110 and related competition models.

Because Steyr match rifles rely on highly consistent air pressure for accuracy, replacing worn seals with genuine OEM components like this O-ring helps maintain optimal reliability, shot consistency, and long-term performance.