FX O Ring 16.5×2 NBR90 5178
Genuine FX Airguns component. FX build their rifles as modular platforms, so parts are model-specific — check this fits your rifle before ordering. If you are unsure, our shops can confirm it against your serial number.
Specifications
| Parameter | Value |
|---|---|
| Size | 16.5mm x 2mm |
| Material | NBR90 |
| Part Number | 5178 |
FAQ
Is this O ring compatible with all FX airguns?
No, this O ring is model-specific. It is designed for certain FX airgun models. Please verify compatibility with your rifle model before purchasing.
How do I confirm if this part fits my rifle?
Check your rifle’s model and serial number against the specifications. Our shops can verify compatibility using your serial number if needed.
What is the material of this O ring?
The O ring is made from NBR90, a durable nitrile rubber suitable for airgun applications.

Fiona Lewis –
Fitted the O ring to my FX airgun without issues. It fits snugly and maintains a good seal. The part arrived on time and matches the description exactly.
Anne MacLeod –
Worked well after installation. I double-checked the model compatibility before ordering and it matched my rifle. No leaks since replacing the old one.
Zoe Paterson –
Ordered this part to replace a worn O ring. It fits perfectly and feels solid. Easy to install and has improved performance in terms of reliability.