Quick Summary
The Bolster Armouries M100 is an Airsoft AEG gearbox spring for AEG rifles. It is described as made in England and is one of several spring strengths in the range, with M90 to M150 available. This page is for the M100 version.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | Bolster Armouries. Use this to confirm you are choosing the correct product family. |
| Product type | Airsoft AEG gearbox spring for AEG rifles. Check that your build uses an AEG gearbox before choosing an offer. |
| Variant | M100. The range also includes M90, M95, M105, M110 and M150, so the exact strength matters. |
| Manufacture | Made in England. This is part of the product identity. |
| Purpose | FPS upgrade spring. Buyers should match the spring strength to their build requirements and site limits. |
What to Compare Before Buying
- Spring strength: This version is M100. Compare that with the output you want for your build.
- Gearbox type: It is for Airsoft AEG gearboxes, so confirm your rifle uses the right platform.
- Version: Other strengths in the range include M90, M95, M105, M110 and M150, so choose the correct one for your setup.
- Site limits: Airsoft sites often have their own FPS rules, so check your intended limit before use.
Before You Decide
Confirm that your rifle uses an AEG gearbox and that M100 is the spring strength you need. If you are choosing between versions, compare the exact strength rather than the product family name. Follow the manufacturer’s instructions and check your site FPS limit before skirmishing.





