Rebel AEG Upgrade Spring — M90 to M130
Rebel AEG Upgrade Spring — M90 to M130
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DETAILS
DETAILS
- description
The main spring is the single component that most directly sets your muzzle energy. Swap it and everything else about the gun stays the same — you have simply changed how hard it pushes. That makes a spring the first thing to reach for when a gun chronos over your site limit, and the last thing to reach for when you want more range.
That order matters. If you are chasing distance rather than raw power, a better hop rubber and a decent tightbore barrel will do far more for you than a heavier spring, and they will not put extra load through your gearbox. A spring change is for hitting a number, not for fixing accuracy.
These are Rebel main springs for standard AEG rifles, sold individually and available in five ratings. Pick the rating to suit the job: M90 and M100 to bring a hot gun down or run comfortably inside a 350 FPS site cap, M110 as the usual sensible upgrade, and M120 or M130 for semi-auto-locked DMR builds where the site allows a higher limit.
Fitting one means opening the gearbox unless your gun has a quick-change spring system. If that is not something you want to take on, we do it in the workshop — and we will chronograph it afterwards so you know exactly what it does before you get to site.
Which rating do I need?
These figures are a guide, not a promise. Actual output depends on your cylinder, piston, air seal, barrel length and bore — the same spring can read forty FPS apart in two different guns. Rebel quote roughly 330 FPS for the M100 and note that power varies from gun to gun; treat every figure below the same way.
| Specification | Detail |
|---|---|
| M90 | Approx. 290–310 FPS — bringing a hot gun down, or CQB-capped sites |
| M100 | Approx. 330 FPS — comfortably inside a 350 FPS site cap |
| M110 | Approx. 350–370 FPS — the common “slightly upgraded” choice |
| M120 | Approx. 380–400 FPS — DMR territory, semi-auto only |
| M130 | Approx. 410–430 FPS — DMR builds on higher-limit sites, semi-auto only |
Specifications
| Specification | Detail |
|---|---|
| Type | AEG main spring |
| Ratings | M90 / M100 / M110 / M120 / M130 |
| Fits | Standard V2 and V3 AEG gearboxes |
| Sold as | Single spring |
| Output | Approximate and setup-dependent — see the guide above |
| Brand | Rebel |
Good to know before you buy
Stronger springs put more load through the whole drivetrain. Past roughly M120 you want a high-torque motor and reinforced internals — piston, piston head, spring guide and bushings — or you are simply choosing which part strips first. Fitting needs the gearbox opening unless your gun has a quick-change spring system.
Frequently asked questions
Which spring will give me exactly 340 FPS?
No spring can promise a number. Output depends on your cylinder, piston, air seal and barrel, so the same spring reads differently in two guns. Pick the nearest rating, chronograph, and adjust from there.
Will a stronger spring make my gun more accurate?
No. Range and accuracy come from the hop rubber, the barrel and consistent air sealing. A spring only changes how hard the BB leaves the barrel. Upgrade hop and barrel first.
Do I need other upgrades to go with it?
Below about M110, usually not. Above that you want a high-torque motor and reinforced internals to cope with the extra load, or you will start breaking pistons and stripping gears.
Can you fit it for me?
Yes. We fit springs in the workshop and chronograph the gun afterwards so you know exactly where it sits before you take it to site.
Which gearboxes do these fit?
Standard V2 and V3 AEG gearboxes, which covers most M4 and AK-pattern rifles. If you are running something unusual, ask us first.