Quick Summary
The Bolster Armouries M105 AEG Airsoft Gearbox Spring is a gearbox spring for Airsoft AEG rifles. It is presented as a spring strength option within a range from M90 to M150, with this version set at M105.
It is described as made in England and as a premium steel spring. The same spring strength is stated as being used inside genuine Bolster Armouries ONYX rifles.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | AEG airsoft gearbox spring for Airsoft AEG rifles. |
| Variant | M105 spring strength. |
| Range | M90-M150 available, so the exact strength is part of the choice. |
| Country of manufacture | Made in England. |
| Material | Steel spring. |
| Reference use | The M105 strength is stated as the same spring strength used inside genuine Bolster Armouries ONYX rifles. |
What to Compare Before Buying
- Spring strength: This version is M105. Compare it with the strength you need for your build and site limits.
- Platform fit: It is intended for Airsoft AEG gearboxes, so check that your rifle uses the same platform.
- Gearbox type: The product is described as fitting most standard AEG gearboxes, including quick-change spring systems, so confirm your gearbox format before choosing.
- Build plan: It is positioned as an upgrade spring, so make sure the rest of your internal setup matches the spring strength you want to use.
Before You Decide
Confirm the M105 strength is the version you want, then check gearbox compatibility and your intended rifle setup before choosing an offer. If your build needs a different spring strength, the same range also includes other M-series options.





